chore(deps-dev): update tox requirement from 4.28.4 to 4.29.0 (#879)

Updates the requirements on [tox](https://github.com/tox-dev/tox) to
permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/releases">tox's
releases</a>.</em></p>
<blockquote>
<h2>4.29.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>Docs: environment variables contain strings by <a
href="https://github.com/hroncok"><code>@​hroncok</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3575">tox-dev/tox#3575</a></li>
<li>🐍 Fix sys_platform Fixture Leakage breaking the CI by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/tox-dev/tox/pull/3589">tox-dev/tox#3589</a></li>
<li>Expose a new <code>tox_extend_envs</code> hook in plugins API by <a
href="https://github.com/webknjaz"><code>@​webknjaz</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3591">tox-dev/tox#3591</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/tox/compare/4.28.4...4.29.0">https://github.com/tox-dev/tox/compare/4.28.4...4.29.0</a></p>
</blockquote>
</details>
<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>v4.29.0 (2025-08-29)</h2>
<p>Features - 4.29.0</p>
<pre><code>- A new tox life cycle event is now exposed for use via
:doc:`Plugins
  API &lt;/plugins&gt;` -- by :user:`webknjaz`.
<p>The corresponding hook point is :func:<code>tox_extend_envs
&amp;lt;tox.plugin.spec.tox_extend_envs&amp;gt;</code>. It allows plugin
authors to
declare ephemeral environments that they can then populate through
the in-memory configuration loader interface.</p>
<p>This patch was made possible thanks to pair programming with
:user:<code>gaborbernat</code> at PyCon US 2025.
(:issue:<code>3510</code>, :issue:<code>3591</code>)</p>
<h2>v4.28.4 (2025-07-31)</h2>
<p>Features - 4.28.4
</code></pre></p>
<ul>
<li>Pass ssh-agent variables <code>SSH_AGENT_PID</code> and
<code>SSH_AUTH_SOCK</code> in <code>pass_env</code> by default.
<ul>
<li>by :user:<code>daniilgankov</code> (:issue:<code>3572</code>)</li>
</ul>
</li>
</ul>
<h2>v4.28.3 (2025-07-25)</h2>
<p>No significant changes.</p>
<h2>v4.28.2 (2025-07-25)</h2>
<p>Bugfixes - 4.28.2</p>
<pre><code>- Don't pass in the filter argument to tar.extractall on old
Python versions - by :user:`gaborbernat`. (:issue:`3568`)
<h2>v4.28.1 (2025-07-22)</h2>
<p>Bugfixes - 4.28.1
</code></pre></p>
<ul>
<li>
<p>Use <code>tarfile.data_filter
&lt;https://docs.python.org/3/library/tarfile.html#tarfile.data_filter&gt;</code>_
with <code>extractall</code>
only on supported Python versions:</p>
<ul>
<li><code>&gt;= 3.11.4</code></li>
<li><code>&gt;= 3.10.12</code> and <code>&lt; 3.11</code></li>
<li><code>&gt;= 3.9.17</code> and <code>&lt; 3.10</code></li>
</ul>
<p>by :user:<code>gaborbernat</code>. (:issue:<code>3565</code>)</p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/59aaee9defa7e3ca4eae644f498037b9b2cbf6c8"><code>59aaee9</code></a>
release 4.29.0</li>
<li><a
href="https://github.com/tox-dev/tox/commit/bf558e375dfac8c85eac6bbfbc13103e64347c31"><code>bf558e3</code></a>
Expose a new <code>tox_extend_envs</code> hook in plugins API (<a
href="https://redirect.github.com/tox-dev/tox/issues/3591">#3591</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/eceba31061fb01f6077f5cd1a93a5b1f01175591"><code>eceba31</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3587">#3587</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/18d294354686b4d8d79ca40e0f2c487e917f65a0"><code>18d2943</code></a>
Fix sys_platform patch in test suite leaking patching (<a
href="https://redirect.github.com/tox-dev/tox/issues/3589">#3589</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/8088ecb03240145cba0179c9dbdca14eda93d1c2"><code>8088ecb</code></a>
Bump actions/checkout from 4 to 5 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3582">#3582</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/c0b411892495499fa391ceb4b5001f76d2926d30"><code>c0b4118</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3581">#3581</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/1e067797eaafcc9283bec2c1bb0520ed47033ccf"><code>1e06779</code></a>
Bump actions/download-artifact from 4 to 5 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3576">#3576</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/7d4cb4e92650545cd4eb45501320d2e2eb6ac2d2"><code>7d4cb4e</code></a>
Docs: environment variables contain strings (<a
href="https://redirect.github.com/tox-dev/tox/issues/3575">#3575</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/9930f8bf62e5bbbdf156f178f9a5b69deda096a4"><code>9930f8b</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3573">#3573</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/tox/compare/4.28.4...4.29.0">compare
view</a></li>
</ul>
</details>
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pyproject.toml

@@ -97,7 +97,7 @@ isort = "6.0.1"
 autopep8 = "2.3.2"
 mypy = "1.17.1"
 tomli = { version = "2.2.1", python = "<3.11" }
-tox = "4.28.4"
+tox = "4.29.0"
 xmldiff = "2.7.0"
 bandit = "1.8.6"
 pyupgrade = "3.20.0"