build(deps): Bump tox from 4.25.0 to 4.26.0 in /.github/workflows in the ci group (#627)

Bumps the ci group in /.github/workflows with 1 update:
[tox](https://github.com/tox-dev/tox).

Updates `tox` from 4.25.0 to 4.26.0
<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>4.26.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>Add a missing quote in a TOML example @ <code>config.rst</code> by
<a href="https://github.com/webknjaz"><code>@​webknjaz</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3509">tox-dev/tox#3509</a></li>
<li>Add colour to GitHub Actions CI logs by <a
href="https://github.com/hugovk"><code>@​hugovk</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3525">tox-dev/tox#3525</a></li>
<li>Fix using deprecated virtualenv option <code>--wheel</code> by <a
href="https://github.com/robsdedude"><code>@​robsdedude</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3528">tox-dev/tox#3528</a></li>
<li>Fix custom HelpFormatter for Python 3.14 by <a
href="https://github.com/The-Compiler"><code>@​The-Compiler</code></a>
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3524">tox-dev/tox#3524</a></li>
<li>Drop support for EOL Python 3.8 by <a
href="https://github.com/hugovk"><code>@​hugovk</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3527">tox-dev/tox#3527</a></li>
<li>Test with Python 3.14 by <a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3533">tox-dev/tox#3533</a></li>
<li>Fix for tox4 regression issue with setenv file and substitutions (<a
href="https://redirect.github.com/tox-dev/tox/issues/2435">#2435</a>) by
<a
href="https://github.com/realitycheck"><code>@​realitycheck</code></a>
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3521">tox-dev/tox#3521</a></li>
<li>Feat: free-threaded python support by <a
href="https://github.com/robsdedude"><code>@​robsdedude</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3526">tox-dev/tox#3526</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
made their first contribution in <a
href="https://redirect.github.com/tox-dev/tox/pull/3533">tox-dev/tox#3533</a></li>
<li><a
href="https://github.com/realitycheck"><code>@​realitycheck</code></a>
made their first contribution in <a
href="https://redirect.github.com/tox-dev/tox/pull/3521">tox-dev/tox#3521</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/tox/compare/4.25.0...4.26.0">https://github.com/tox-dev/tox/compare/4.25.0...4.26.0</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>v4.26.0 (2025-05-13)</h2>
<p>Features - 4.26.0</p>
<pre><code>- Add support for free-threaded python builds.
Factors like ``py313t`` will only pick builds with the GIL disabled
while factors without trailing ``t`` will only pick
  builds without no-GIL support. (:issue:`3391`)
- Drop support for EOL Python 3.8. (:issue:`3527`)
<p>Bugfixes - 4.26.0
</code></pre></p>
<ul>
<li>Fix a regression issue related to inability to use
<code>file|</code> substitution option in nested <code>set_env</code>
sections of <code>ini</code> configurations since tox4 update.
(:issue:<code>2435</code>)</li>
<li>Fix <code>TypeError</code> for <code>HelpFormatter</code> with
Python 3.14 (:issue:<code>3523</code>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/7c3fae80cf4a68e126a3ae222ceebdc82cc44b68"><code>7c3fae8</code></a>
release 4.26.0</li>
<li><a
href="https://github.com/tox-dev/tox/commit/92d4ed35c7dd4ae3bd1dc5cc7479a43850ff50b9"><code>92d4ed3</code></a>
Feat: free-threaded python support (<a
href="https://redirect.github.com/tox-dev/tox/issues/3526">#3526</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/957f2f8a35f9519a3b01327888fac2e01f45d066"><code>957f2f8</code></a>
Fix for tox4 regression issue with setenv file and substitutions (<a
href="https://redirect.github.com/tox-dev/tox/issues/2435">#2435</a>)
(<a
href="https://redirect.github.com/tox-dev/tox/issues/3521">#3521</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/5f07ba85828cca7967c934f2ad50c6a0410406dc"><code>5f07ba8</code></a>
Test with Python 3.14 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3533">#3533</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/50e51eb8f17352f4ccbb0c2752157afdb622c3ed"><code>50e51eb</code></a>
Drop support for EOL Python 3.8 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3527">#3527</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/19126daf113a05a10e53a93887b3a0d990a82df6"><code>19126da</code></a>
Fix custom HelpFormatter for Python 3.14 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3524">#3524</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/f082f80fc80411c052c2cf0e27e953568eac2ce9"><code>f082f80</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3522">#3522</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/51aac32e79261f2cbdb0251fb7932bc270e3f023"><code>51aac32</code></a>
Fix using deprecated virtualenv option <code>--wheel</code> (<a
href="https://redirect.github.com/tox-dev/tox/issues/3528">#3528</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/b770ed5b49a579a2d01303b971c4c33a90a8b00a"><code>b770ed5</code></a>
Add colour to CI logs (<a
href="https://redirect.github.com/tox-dev/tox/issues/3525">#3525</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/4a8e50e2cdd420d0b058b747092dbfc72192db51"><code>4a8e50e</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3520">#3520</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/tox-dev/tox/compare/4.25.0...4.26.0">compare
view</a></li>
</ul>
</details>
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.github/workflows/constraints.txt

@@ -1,2 +1,2 @@
-tox==4.25.0
+tox==4.26.0
 tox-uv==1.25.0