Bump ipython from 8.26.0 to 8.28.0 (#1625)

Bumps [ipython](https://github.com/ipython/ipython) from 8.26.0 to
8.28.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ipython/ipython/commit/a9c7369d725c7ab50e92f8f84329a0d7048dd6c8"><code>a9c7369</code></a>
release 8.28.0</li>
<li><a
href="https://github.com/ipython/ipython/commit/0e62e658a870ed004eae90afac4a30d4d16b1e6b"><code>0e62e65</code></a>
What's new and update release tools (<a
href="https://redirect.github.com/ipython/ipython/issues/14530">#14530</a>)</li>
<li><a
href="https://github.com/ipython/ipython/commit/9b8d0c387597c739a6a5be3d33e8be106385c939"><code>9b8d0c3</code></a>
What's new and update release tools</li>
<li><a
href="https://github.com/ipython/ipython/commit/0d3a38c0c9608fe3966888cdca57c6adda7e5a22"><code>0d3a38c</code></a>
DOC: whatsnew/v8: Update release notes for the Mamba and Micromamba
magic com...</li>
<li><a
href="https://github.com/ipython/ipython/commit/b91233156fe0d295fc29b95ede9d177ede548734"><code>b912331</code></a>
Update docs/source/whatsnew/version8.rst</li>
<li><a
href="https://github.com/ipython/ipython/commit/d23bee0cb5216d2e9ce752b47f67e559a18e8e6b"><code>d23bee0</code></a>
Use environment variable to identify conda / mamba (<a
href="https://redirect.github.com/ipython/ipython/issues/14515">#14515</a>)</li>
<li><a
href="https://github.com/ipython/ipython/commit/06f266d213e12ecf8f0b96ca2efd8a74b67103ee"><code>06f266d</code></a>
Update docs/source/whatsnew/version8.rst</li>
<li><a
href="https://github.com/ipython/ipython/commit/e77bdfaddf9731897db32c1bbc496775a26d9eff"><code>e77bdfa</code></a>
remove json report files (<a
href="https://redirect.github.com/ipython/ipython/issues/14529">#14529</a>)</li>
<li><a
href="https://github.com/ipython/ipython/commit/ea2fce1fbb2749e8ad8ffe2f95015f7c346d8e0f"><code>ea2fce1</code></a>
[PR]: Make values public (_tb_highlight &amp; _tb_highlight_style) (<a
href="https://redirect.github.com/ipython/ipython/issues/14518">#14518</a>)</li>
<li><a
href="https://github.com/ipython/ipython/commit/ab2053a3d9069f5c30faf23baef4724c4782dfc5"><code>ab2053a</code></a>
remove json report files</li>
<li>Additional commits viewable in <a
href="https://github.com/ipython/ipython/compare/8.26.0...8.28.0">compare
view</a></li>
</ul>
</details>
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docs/requirements.txt

@@ -7,7 +7,7 @@ opencv-python-headless==4.10.0.84
 # docs
 markupsafe==2.1.5
 nbconvert>=7.2.3
-ipython==8.26.0
+ipython==8.28.0
 sphinx==7.2.6
 pydata-sphinx-theme==0.15.2
 sphinx-copybutton