chore(deps-dev): update tox requirement from 4.18.1 to 4.20.0 (#680)

Updates the requirements on [tox](https://github.com/tox-dev/tox) to
permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/blob/main/docs/changelog.rst">tox's
changelog</a>.</em></p>
<blockquote>
<h2>v4.20.0 (2024-09-18)</h2>
<p>Features - 4.20.0</p>
<pre><code>- Separate the list dependencies functionality to a separate
abstract class allowing code reuse in plugins (such as
  ``tox-uv``) - by :gaborbernat`. (:issue:`3347`)
<h2>v4.19.0 (2024-09-17)</h2>
<p>Features - 4.19.0
</code></pre></p>
<ul>
<li>Support <code>pypy-&lt;major&gt;.&lt;minor&gt;</code> environment
names for PyPy environments - by :user:<code>gaborbernat</code>.
(:issue:<code>3346</code>)</li>
</ul>
<h2>v4.18.1 (2024-09-07)</h2>
<p>Bugfixes - 4.18.1</p>
<pre><code>- Fix and test the string spec for the ``sys.executable``
interpreter (introduced in :pull:`3325`)
  - by :user:`hroncok` (:issue:`3327`)
<p>Improved Documentation - 4.18.1
</code></pre></p>
<ul>
<li>Changes the <code>tox_env_teardown</code> docstring to explain the
hook is called after a tox env was teared down.
(:issue:<code>3305</code>)</li>
</ul>
<h2>v4.18.0 (2024-08-13)</h2>
<p>Features - 4.18.0</p>
<pre><code>- Suppress spinner in parallel runs in CI - by :user:`ziima`.
(:issue:`3318`)
<p>Bugfixes - 4.18.0
</code></pre></p>
<ul>
<li>Boost temporary directories cleanup in tests - by
:user:<code>ziima</code>. (:issue:<code>3278</code>)</li>
<li>Fix absolute base python paths conflicting - by
:user:<code>gaborbernat</code>. (:issue:<code>3325</code>)</li>
</ul>
<h2>v4.17.1 (2024-08-07)</h2>
<p>Bugfixes - 4.17.1</p>
<pre><code>- Support for running ``-e &lt;major&gt;.&lt;minor&gt;`` has
been lost, fixing it - by :user:`gaborbernat`. (:issue:`2849`)
- ``base_python`` now accepts absolute paths to interpreter executable -
by :user:`paveldikov`. (:issue:`3191`)
<h2>v4.17.0 (2024-08-05)</h2>
<p>&lt;/tr&gt;&lt;/table&gt;
</code></pre></p>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/a04cc3afa08e4641ba8419eb320e738d4ef8180c"><code>a04cc3a</code></a>
release 4.20.0</li>
<li><a
href="https://github.com/tox-dev/tox/commit/4d8f5fd826276b59a73a4851dcc2fbb388a0d574"><code>4d8f5fd</code></a>
Separate list dependencies to a separate installer class (<a
href="https://redirect.github.com/tox-dev/tox/issues/3347">#3347</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/0cb816c572a1b549c9e1b20d3bee4ed3fbde6b43"><code>0cb816c</code></a>
YML to YAML</li>
<li><a
href="https://github.com/tox-dev/tox/commit/2f8362416fdcc94ed99b99d81387ac5ea20311f1"><code>2f83624</code></a>
release 4.19.0</li>
<li><a
href="https://github.com/tox-dev/tox/commit/ed6b0dcdd61fac5db7194ca0f84885bf132107d5"><code>ed6b0dc</code></a>
Add pypy-major.minor environment name support (<a
href="https://redirect.github.com/tox-dev/tox/issues/3346">#3346</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/8127c7f64e29787b972f8b4355ab0f89dc0820da"><code>8127c7f</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3345">#3345</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/8cadfa294ae4f896ff8bb2668cac35bd42fad1db"><code>8cadfa2</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3341">#3341</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/tox/compare/4.18.1...4.20.0">compare
view</a></li>
</ul>
</details>
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pyproject.toml

@@ -94,7 +94,7 @@ pep8-naming = "0.14.1"
 isort = "5.13.2"
 autopep8 = "2.3.1"
 mypy = "1.11.2"
-tox = "4.18.1"
+tox = "4.20.0"
 xmldiff = "2.7.0"
 bandit = "1.7.9"