…~=9.0.3 in /gh-pages (#3907)

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-9.0.3</h2>
<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 <code>h[1-6]</code> 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>
</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-9.0.3+insiders-4.27.1 (2022-01-08)</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 (2022-01-08)</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>
<p>mkdocs-material-9.0.2 (2022-01-04)</p>
<ul>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4823">#4823</a>: Improved contrast ratio in footer to meet WCAG guidelines</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4819">#4819</a>: Social plugin crashes when card generation is disabled</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4817">#4817</a>: Search plugin crashes on numeric page titles in nav</li>
</ul>
<p>mkdocs-material-9.0.1 (2022-01-03)</p>
<ul>
<li>Removed pipdeptree dependency for built-in info plugin</li>
<li>Fixed appearance of linked tags when hovered (9.0.0 regression)</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4810">#4810</a>: Abbreviations run out of screen on touch devices</li>
<li>Fixed <a href="https://github-redirect.dependabot.com/squidfunk/mkdocs-material/issues/4813">#4813</a>: View source and edit button links are the same</li>
</ul>
<p>mkdocs-material-9.0.0 (2023-01-02)</p>
<p>Additions and improvements</p>
<ul>
<li>Added support for rich search previews</li>
<li>Added support for tokenizer lookahead</li>
<li>Added support for better search highlighting</li>
<li>Added support for excluding content from search</li>
<li>Added support for configurable search pipeline</li>
<li>Added support for offline search via offline plugin</li>
<li>Added support for multiple instances of built-in tags plugin</li>
<li>Added support for removing copy-to-clipboard button</li>
<li>Added support for removing footer navigation</li>
<li>Added support for button to view the source of a page</li>
<li>Improved readability of query string for search sharing</li>
<li>Improved stability of search plugin when using --dirtyreload</li>
<li>Improved search result group button, now sticky and stable</li>
<li>Updated Norwegian translations</li>
<li>Updated MkDocs to 1.4.2</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/eab3eae25dad6bf03e68bc1ddf22aeace50e6142"><code>eab3eae</code></a> Prepare 9.0.3 release</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/35e6eed4627c137007873ab2f4521b8e8f91dbc0"><code>35e6eed</code></a> Updated dependencies</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/f8f44f58376206903e925d0b3db1e6e5f89e94ca"><code>f8f44f5</code></a> Improved accessibility of sidebar navigation</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/5b35b7df5773efe37babfb54343151a355ca988f"><code>5b35b7d</code></a> Updated Indonesian translations</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/1d0f993a4ada669b2c0c302fb8d9c2a20f832963"><code>1d0f993</code></a> Updated Indonesian translations</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/318903db589c9b73e7e1074b24a530ac1ad63032"><code>318903d</code></a> Fixed anchor tracking not working for anchors in tables</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/8a812aed83b217816f017dc2c8ac34dbc6545afd"><code>8a812ae</code></a> Fixed search not closing on same anchor selection</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/68257348b883ca6bccc514e1afdad8852a458646"><code>6825734</code></a> Improved collapsing of adjacent whitespace and removal of empty elements in s...</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/7484b19e9aa5712b8e22ae03786cba68fbde65cc"><code>7484b19</code></a> Removed unnecessary code from search plugin</li>
<li><a href="https://github.com/squidfunk/mkdocs-material/commit/81e7b8c7fc53d32c8a8730ae68614d8925388782"><code>81e7b8c</code></a> Fixed search plugin crashing on nested headlines</li>
<li>Additional commits viewable in <a href="https://github.com/squidfunk/mkdocs-material/compare/8.5.11...9.0.3">compare view</a></li>
</ul>
</details>
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