Bump urllib3 from 1.26.5 to 1.26.18 in /docs (#525)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 to
1.26.18.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/releases">urllib3's
releases</a>.</em></p>
<blockquote>
<h2>1.26.18</h2>
<ul>
<li>Made body stripped from HTTP requests changing the request method to
GET after HTTP 303 &quot;See Other&quot; redirect responses.
(GHSA-g4mx-q9vg-27p4)</li>
</ul>
<h2>1.26.17</h2>
<ul>
<li>Added the <code>Cookie</code> header to the list of headers to strip
from requests when redirecting to a different host. As before, different
headers can be set via <code>Retry.remove_headers_on_redirect</code>.
(GHSA-v845-jxx5-vc9f)</li>
</ul>
<h2>1.26.16</h2>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code>
with many distinct origins would cause connection pools to be closed
while requests are in progress (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2954">#2954</a>)</li>
</ul>
<h2>1.26.15</h2>
<ul>
<li>Fix socket timeout value when HTTPConnection is reused (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2645">urllib3/urllib3#2645</a>)</li>
<li>Remove &quot;!&quot; character from the unreserved characters in
IPv6 Zone ID parsing (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2899">urllib3/urllib3#2899</a>)</li>
<li>Fix IDNA handling of 'x80' byte (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2901">urllib3/urllib3#2901</a>)</li>
</ul>
<h2>1.26.14</h2>
<ul>
<li>Fixed parsing of port 0 (zero) returning None, instead of 0 (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2850">#2850</a>)</li>
<li>Removed deprecated <code>HTTPResponse.getheaders()</code> calls in
<code>urllib3.contrib</code> module.</li>
</ul>
<h2>1.26.13</h2>
<ul>
<li>Deprecated the <code>HTTPResponse.getheaders()</code> and
<code>HTTPResponse.getheader()</code> methods.</li>
<li>Fixed an issue where parsing a URL with leading zeroes in the port
would be rejected even when the port number after removing the zeroes
was valid.</li>
<li>Fixed a deprecation warning when using cryptography v39.0.0.</li>
<li>Removed the <code>&lt;4</code> in the <code>Requires-Python</code>
packaging metadata field.</li>
</ul>
<h2>1.26.12</h2>
<ul>
<li>Deprecated the <code>urllib3[secure]</code> extra and the
<code>urllib3.contrib.pyopenssl</code> module. Both will be removed in
v2.x. See this <a
href="https://redirect.github.com/urllib3/urllib3/issues/2680">GitHub
issue</a> for justification and info on how to migrate.</li>
</ul>
<h2>1.26.11</h2>
<p><strong>If you or your organization rely on urllib3 consider
supporting us via <a href="https://github.com/sponsors/urllib3">GitHub
Sponsors</a>.</strong></p>
<p>:warning: <strong>urllib3 v2.0 will drop support for Python
2</strong>: <a
href="https://urllib3.readthedocs.io/en/latest/v2-roadmap.html">Read
more in the v2.0 Roadmap</a></p>
<ul>
<li>Fixed an issue where reading more than 2 GiB in a call to
HTTPResponse.read would raise an OverflowError on Python 3.9 and
earlier.</li>
</ul>
<h2>1.26.10</h2>
<p><strong>If you or your organization rely on urllib3 consider
supporting us via <a href="https://github.com/sponsors/urllib3">GitHub
Sponsors</a>.</strong></p>
<p>:warning: <strong>urllib3 v2.0 will drop support for Python
2</strong>: <a
href="https://urllib3.readthedocs.io/en/latest/v2-roadmap.html">Read
more in the v2.0 Roadmap</a></p>
<p>:closed_lock_with_key: <strong>This is the first release to be signed
with Sigstore!</strong> You can verify the distributables using the
<code>.sig</code> and <code>.crt</code> files included on this
release.</p>
<ul>
<li>Removed support for Python 3.5</li>
<li>Fixed an issue where a <code>ProxyError</code> recommending
configuring the proxy as HTTP instead of HTTPS could appear even when an
HTTPS proxy wasn't configured.</li>
</ul>
<h2>1.26.9</h2>
<p><strong>If you or your organization rely on urllib3 consider
supporting us via <a href="https://github.com/sponsors/urllib3">GitHub
Sponsors</a>.</strong></p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's
changelog</a>.</em></p>
<blockquote>
<h1>1.26.18 (2023-10-17)</h1>
<ul>
<li>Made body stripped from HTTP requests changing the request method to
GET after HTTP 303 &quot;See Other&quot; redirect responses.</li>
</ul>
<h1>1.26.17 (2023-10-02)</h1>
<ul>
<li>Added the <code>Cookie</code> header to the list of headers to strip
from requests when redirecting to a different host. As before, different
headers can be set via <code>Retry.remove_headers_on_redirect</code>.
(<code>[#3139](urllib3/urllib3#3139)
&lt;https://github.com/urllib3/urllib3/pull/3139&gt;</code>_)</li>
</ul>
<h1>1.26.16 (2023-05-23)</h1>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code>
with many distinct origins
would cause connection pools to be closed while requests are in progress
(<code>[#2954](urllib3/urllib3#2954)
&lt;https://github.com/urllib3/urllib3/pull/2954&gt;</code>_)</li>
</ul>
<h1>1.26.15 (2023-03-10)</h1>
<ul>
<li>Fix socket timeout value when <code>HTTPConnection</code> is reused
(<code>[#2645](urllib3/urllib3#2645)
&lt;https://github.com/urllib3/urllib3/issues/2645&gt;</code>__)</li>
<li>Remove &quot;!&quot; character from the unreserved characters in
IPv6 Zone ID parsing
(<code>[#2899](urllib3/urllib3#2899)
&lt;https://github.com/urllib3/urllib3/issues/2899&gt;</code>__)</li>
<li>Fix IDNA handling of '\x80' byte
(<code>[#2901](urllib3/urllib3#2901)
&lt;https://github.com/urllib3/urllib3/issues/2901&gt;</code>__)</li>
</ul>
<h1>1.26.14 (2023-01-11)</h1>
<ul>
<li>Fixed parsing of port 0 (zero) returning None, instead of 0.
(<code>[#2850](urllib3/urllib3#2850)
&lt;https://github.com/urllib3/urllib3/issues/2850&gt;</code>__)</li>
<li>Removed deprecated getheaders() calls in contrib module. Fixed the
type hint of <code>PoolKey.key_retries</code> by adding
<code>bool</code> to the union.
(<code>[#2865](urllib3/urllib3#2865)
&lt;https://github.com/urllib3/urllib3/issues/2865&gt;</code>__)</li>
</ul>
<h1>1.26.13 (2022-11-23)</h1>
<ul>
<li>Deprecated the <code>HTTPResponse.getheaders()</code> and
<code>HTTPResponse.getheader()</code> methods.</li>
<li>Fixed an issue where parsing a URL with leading zeroes in the port
would be rejected
even when the port number after removing the zeroes was valid.</li>
<li>Fixed a deprecation warning when using cryptography v39.0.0.</li>
<li>Removed the <code>&lt;4</code> in the <code>Requires-Python</code>
packaging metadata field.</li>
</ul>
<h1>1.26.12 (2022-08-22)</h1>
<ul>
<li>Deprecated the <code>urllib3[secure]</code> extra and the
<code>urllib3.contrib.pyopenssl</code> module.
Both will be removed in v2.x. See this <code>GitHub issue
&lt;https://github.com/urllib3/urllib3/issues/2680&gt;</code>_
for justification and info on how to migrate.</li>
</ul>
<h1>1.26.11 (2022-07-25)</h1>
<ul>
<li>Fixed an issue where reading more than 2 GiB in a call to
<code>HTTPResponse.read</code> would</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/urllib3/urllib3/commit/9c2c2307dd1d6af504e09aac0326d86ee3597a0b"><code>9c2c230</code></a>
Release 1.26.18 (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3159">#3159</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/b594c5ceaca38e1ac215f916538fb128e3526a36"><code>b594c5c</code></a>
Merge pull request from GHSA-g4mx-q9vg-27p4</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/944f0eb134485f41bc531be52de12ba5a37bca73"><code>944f0eb</code></a>
[1.26] Use vendored six in urllib3.contrib.securetransport</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/c9016bf464751a02b7e46f8b86504f47d4238784"><code>c9016bf</code></a>
Release 1.26.17</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb"><code>0122035</code></a>
Backport GHSA-v845-jxx5-vc9f (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3139">#3139</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/e63989f97d206e839ab9170c8a76e3e097cc60e8"><code>e63989f</code></a>
Fix installing <code>brotli</code> extra on Python 2.7</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/2e7a24d08713a0131f0b3c7197889466d645cc49"><code>2e7a24d</code></a>
[1.26] Configure OS for RTD to fix building docs</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/57181d6ea910ac7cb2ff83345d9e5e0eb816a0d0"><code>57181d6</code></a>
[1.26] Improve error message when calling urllib3.request() (<a
href="https://redirect.github.com/urllib3/urllib3/issues/3058">#3058</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/3c0148048a523325819377b23fc67f8d46afc3aa"><code>3c01480</code></a>
[1.26] Run coverage even with failed jobs</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/d94029b7e2193ff47b627906a70e06377a09aae8"><code>d94029b</code></a>
Release 1.26.16</li>
<li>Additional commits viewable in <a
href="https://github.com/urllib3/urllib3/compare/1.26.5...1.26.18">compare
view</a></li>
</ul>
</details>
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docs/requirements.txt

@@ -280,8 +280,9 @@ typing-extensions==4.1.1 \
     --hash=sha256:1a9462dcc3347a79b1f1c0271fbe79e844580bb598bafa1ed208b94da3cdcd42 \
     --hash=sha256:21c85e0fe4b9a155d0799430b0ad741cdce7e359660ccbd8b530613e8df88ce2
     # via myst-parser
-urllib3==1.26.5 \
-    --hash=sha256:753a0374df26658f99d826cfe40394a686d05985786d946fbe4165b5148f5a7c
+urllib3==1.26.18 \
+    --hash=sha256:34b97092d7e0a3a8cf7cd10e386f401b3737364026c45e622aa02903dffe0f07 \
+    --hash=sha256:f8ecc1bba5667413457c529ab955bf8c67b45db799d159066261719e328580a0
     # via requests
 zipp==3.16.2 \
     --hash=sha256:679e51dd4403591b2d6838a48de3d283f3d188412a9782faadf845f298736ba0 \