chore(deps-dev): Update mkdocs-material requirement from ~=9.7.3 to ~=9.7.4 in /gh-pages (#5053)

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/squidfunk/mkdocs-material/releases">mkdocs-material's releases</a>.</em></p>
<blockquote>
<h2>mkdocs-material-9.7.4</h2>
<blockquote>
<p>[!WARNING]</p>
<p><strong>Material for MkDocs is in maintenance mode</strong></p>
<p>Going forward, the Material for MkDocs team focuses on <a href="https://zensical.org">Zensical</a>, a next-gen static site generator built from first principles. We will provide critical bug fixes and security updates for Material for MkDocs until November 2026.</p>
<p><a href="https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/">Read the full announcement on our blog</a></p>
</blockquote>
<h2>Changes</h2>
<ul>
<li>Hardened social cards plugin by switching to sandboxed environment (recommended by <a href="https://github.com/caveeroo"><code>@​caveeroo</code></a>)</li>
<li>Updated MkDocs 2.0 incompatibility warning</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG">mkdocs-material's changelog</a>.</em></p>
<blockquote>
<p>mkdocs-material-9.7.4 (2026-03-03)</p>
<ul>
<li>Hardened social cards plugin by switching to sandboxed environment</li>
<li>Updated MkDocs 2.0 incompatibility warning</li>
</ul>
<p>mkdocs-material-9.7.3 (2026-02-24)</p>
<ul>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8567">#8567</a>: Print MkDocs 2.0 incompatibility warning to stderr</li>
</ul>
<p>mkdocs-material-9.7.2 (2026-02-18)</p>
<ul>
<li>Opened up version ranges of optional dependencies for forward-compatibility</li>
<li>Added warning to 'mkdocs build' about impending MkDocs 2.0 incompatibility</li>
</ul>
<p>mkdocs-material-9.7.1 (2025-12-18)</p>
<ul>
<li>Updated requests to 2.30+ to mitigate CVE in urllib</li>
<li>Fixed privacy plugin not picking up protocol-relative URLs</li>
<li>Fixed <a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8542">#8542</a>: false positives and negatives captured in privacy plugin</li>
</ul>
<p>mkdocs-material-9.7.0 (2025-11-11)</p>
<p>⚠️ Material for MkDocs is now in maintenance mode</p>
<p>This is the last release of Material for MkDocs that will receive new features.
Going forward, the Material for MkDocs team focuses on Zensical, a next-gen
static site generator built from first principles. We will provide critical
bug fixes and security updates for Material for MkDocs for 12 months at least.</p>
<p>Read the full announcement on our blog:
<a href="https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/">https://squidfunk.github.io/mkdocs-material/blog/2025/11/05/zensical/</a></p>
<p>This release includes all features that were previously exclusive to the
Insiders edition. These features are now freely available to everyone.</p>
<p>Note on deprecated plugins: The projects and typeset plugins are included in
this release, but must be considered deprecated. Both plugins proved
unsustainable to maintain and represent architectural dead ends. They are
provided as-is without ongoing support.</p>
<p>Changes:</p>
<ul>
<li>Added support for pinned blog posts and author profiles</li>
<li>Added support for customizing pagination for blog index pages</li>
<li>Added support for customizing blog category sort order</li>
<li>Added support for staying on page when switching languages</li>
<li>Added support for disabling tags in table of contents</li>
<li>Added support for nested tags and shadow tags</li>
<li>Added support for footnote tooltips</li>
<li>Added support for instant previews</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/9580c28d2a8d8e7d088a203da4f98d2e31624c48"><code>9580c28</code></a> Prepare 9.7.4 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/4ae913c05f9cc5c4d31efbb5ffaf46880ceb323f"><code>4ae913c</code></a> Updated MkDocs 2.0 warning message</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/fdf40c096fca6b4730ebd4f36548710f1448f6f0"><code>fdf40c0</code></a> Bump minimatch (<a href="https://redirect.github.com/squidfunk/mkdocs-material/issues/8570">#8570</a>)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/b368bed9896f0d86ec10f61a4189d01f7d7e8f5c"><code>b368bed</code></a> Switched social card generator to sandboxed Jinja environment</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/e2d00129ddcc84553202428e0c1dde93d768f3d7"><code>e2d0012</code></a> Updated blog post with note on environment variable</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/fc7b41e1e5c26723ff244cf406cc5af785dc2772"><code>fc7b41e</code></a> Updated changelog</li>
<li>See full diff in <a href="https://github.com/squidfunk/mkdocs-material/compare/9.7.3...9.7.4">compare view</a></li>
</ul>
</details>
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gh-pages/requirements-dev.txt

@@ -1,4 +1,4 @@
 mkdocs~=1.6.1
 mkdocs-awesome-pages-plugin~=2.10.1
-mkdocs-material~=9.7.3
+mkdocs-material~=9.7.4
 mkdocs-git-revision-date-plugin~=0.3.2