Build(deps-dev): bump tox from 4.48.1 to 4.49.0 (#376)

Bumps [tox](https://github.com/tox-dev/tox) from 4.48.1 to 4.49.0.
<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>v4.49.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>✨ feat(config): add {factor:label} substitution for TOML by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/tox-dev/tox/pull/3865">tox-dev/tox#3865</a></li>
<li>🐛 fix(legacy): initialize config_format and output_file for
--showconfig by <a
href="https://github.com/rares985"><code>@​rares985</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3867">tox-dev/tox#3867</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/rares985"><code>@​rares985</code></a>
made their first contribution in <a
href="https://redirect.github.com/tox-dev/tox/pull/3867">tox-dev/tox#3867</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/tox/compare/4.48.1...4.49.0">https://github.com/tox-dev/tox/compare/4.48.1...4.49.0</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>
<h1>Features - 4.49.0</h1>
<ul>
<li>Add <code>{factor:label}</code> substitution for TOML configs --
factor groups in <code>product</code> matrices and <code>env_base</code>
factors
can now be labeled with single-key dicts (e.g., <code>{ecosystem =
[&quot;oci&quot;, &quot;python&quot;]}</code>), enabling
<code>{factor:ecosystem}</code>
in any string value (descriptions, commands, etc.) to resolve to the
active factor. Plain lists automatically get
positional labels (<code>{factor:0}</code>, <code>{factor:1}</code>,
...) - by :user:<code>gaborbernat</code>. (:issue:<code>3860</code>)
(:issue:<code>3860</code>)</li>
</ul>
<h1>Bug fixes - 4.49.0</h1>
<ul>
<li>Fix <code>--showconfig</code> and <code>--help-ini</code> legacy
flags raising <code>AttributeError</code> after config format options
were added
<ul>
<li>by :user:<code>rares985</code> (:issue:<code>3866</code>)</li>
</ul>
</li>
</ul>
<hr />
<p>v4.48.1 (2026-03-06)</p>
<hr />
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/6c452bbe2e936f7fd5cfa02ea66ca44dd0adb948"><code>6c452bb</code></a>
release 4.49.0</li>
<li><a
href="https://github.com/tox-dev/tox/commit/1c59d54357ed62bf963614b9a804e1bfd237f172"><code>1c59d54</code></a>
🐛 fix(legacy): initialize config_format and output_file for --showconfig
(<a
href="https://redirect.github.com/tox-dev/tox/issues/3867">#3867</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/2382601655dbfa61600a7f423e36d2f301382bfc"><code>2382601</code></a>
✨ feat(config): add {factor:label} substitution for TOML (<a
href="https://redirect.github.com/tox-dev/tox/issues/3865">#3865</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/tox/compare/4.48.1...4.49.0">compare
view</a></li>
</ul>
</details>
<br />


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Author: github-actions[bot]