chore(deps-dev): Update mkdocs-material requirement from ~=9.0.5 to ~=9.0.6 in /gh-pages (#3921)

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-9.0.6</h2>
<ul>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4883">#4883</a>: Automatically disable info plugin when serving</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4885">#4885</a>: Search plugin crashes in some exotic cases (9.0.3 regression)</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-9.0.6+insiders-4.29.0 (2023-01-21)</p>
<ul>
<li>Added built-in optimize plugin for automatically compressing images</li>
<li>Switched reporting in built-in privacy plugin to info level</li>
</ul>
<p>mkdocs-material-9.0.6 (2023-01-19)</p>
<ul>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4883">#4883</a>: Automatically disable info plugin when serving</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4885">#4885</a>: Search plugin crashes in some exotic cases (9.0.3 regression)</li>
</ul>
<p>mkdocs-material-9.0.5+insiders-4.28.1 (2023-01-17)</p>
<ul>
<li>Fixed built-in info plugin erroring for Insiders on version check</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4865">#4865</a>: Navigation paths render bug when there's no top-level section</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4875">#4875</a>: Added support for hiding navigation paths</li>
<li>Improved navigation path to not render for a single item</li>
</ul>
<p>mkdocs-material-9.0.5+insiders-4.28.0 (2023-01-14)</p>
<ul>
<li>Added support for navigation path (breadcrumbs)</li>
</ul>
<p>mkdocs-material-9.0.5 (2023-01-14)</p>
<ul>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4842">#4842</a>: Improved accessibility of search result list</li>
</ul>
<p>mkdocs-material-9.0.4 (2023-01-12)</p>
<ul>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4823">#4823</a>: Improved contrast ratio in footer (9.0.2 regression)</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4832">#4832</a>: Set navigation items back to black (9.0.3 regression)</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4843">#4843</a>: Emojis broken due to maxcdn.com shutting down</li>
<li>Upgraded Python Markdown Extensions to 9.9.1</li>
</ul>
<p>mkdocs-material-9.0.3+insiders-4.27.1 (2023-01-08)</p>
<ul>
<li>Fixed rendering of succeeding navigation items in typeset plugin</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4795">#4795</a>: Built-in typeset plugin changes MkDocs' title precedence</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4724">#4724</a>: Blog plugin not rendering integrate table of contents</li>
</ul>
<p>mkdocs-material-9.0.3 (2023-01-08)</p>
<ul>
<li>Improved discernability of section index pages in navigation</li>
<li>Improved collapsing of adjacent whitespace in search plugin</li>
<li>Updated Indonesian translations</li>
<li>Fixed view source of this page button when edit URL points to blob</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4829">#4829</a>: Search overlay does not close for active anchor result</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4824">#4824</a>: Search plugin crashes for h1-6 contained in other elements</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4804">#4804</a>: Nested navigation items not expandable with keyboard</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4689">#4689</a>: anchor tracking not working for anchors in tables</li>
<li>Upgraded to Mermaid 9.3.0</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/5a228db63f7ce8936e220a78b261543f239b4ba7"><code>5a228db</code></a> Prepare 9.0.6 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/e7013e66a9acf4a384cd1a6b2be919ceea1f8a29"><code>e7013e6</code></a> Fixed search crashing for some nested heading combinations (9.0.3 regression)</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/c31ef005b4fd791c48381694c68fb6f9701e72c7"><code>c31ef00</code></a> Disabled info plugin on serve by default</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/6119df5d56fcdc90e25c5b1a47f7d2eba77f589e"><code>6119df5</code></a> Merge branch 'master' of github.com:squidfunk/mkdocs-material</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/b4c2ce4c1376620fe5cdcdcb8c89974f588e6a10"><code>b4c2ce4</code></a> Updated Insiders changelog</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/30f8bf9d97f4673d8e3b123d460154be80b1ea2b"><code>30f8bf9</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4876">#4876</a> from timvink/patch-1</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/f95de7ac888116b0cf06deb340d81f3f01c93936"><code>f95de7a</code></a> Fix issue with 'detected dubious ownership' in docker image</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/ba3948f854ac681764cfb39c33244aab201fb5d8"><code>ba3948f</code></a> Updated dependencies</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/b2611483fa068ce798faeb1d29ee7afbe1918390"><code>b261148</code></a> Fixed info plugin latest version check for Insiders</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/28669259f0416e07260c62dbe64632e328ffdd73"><code>2866925</code></a> Updated changelog</li>
<li>Additional commits viewable in <a href="https://github.com/squidfunk/mkdocs-material/compare/9.0.5...9.0.6">compare view</a></li>
</ul>
</details>
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gh-pages/requirements-dev.txt

@@ -1,4 +1,4 @@
 mkdocs~=1.4.2
 mkdocs-awesome-pages-plugin~=2.8.0
-mkdocs-material~=9.0.5
+mkdocs-material~=9.0.6
 mkdocs-git-revision-date-plugin~=0.3.2