Bumps [tox](https://github.com/tox-dev/tox) from 4.28.4 to 4.29.0. <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>  <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 </plugins>` -- by :user:`webknjaz`. <p>The corresponding hook point is :func:<code>tox_extend_envs &lt;tox.plugin.spec.tox_extend_envs&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>) </code></pre></p> </blockquote> </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> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=tox&package-manager=pip&previous-version=4.28.4&new-version=4.29.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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