chore(deps): bump rexml from 3.3.6 to 3.3.9 in /docs (#5868)

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.6 to 3.3.9.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/rexml/releases">rexml's
releases</a>.</em></p>
<blockquote>
<h2>REXML 3.3.9 - 2024-10-24</h2>
<h3>Improvements</h3>
<ul>
<li>Improved performance.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/210">GH-210</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
</ul>
<h3>Fixes</h3>
<ul>
<li>
<p>Fixed a parse bug for text only invalid XML.</p>
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/215">GH-215</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
<li>
<p>Fixed a parse bug that <code>&amp;#0x...;</code> is accepted as a
character
reference.</p>
</li>
</ul>
<h3>Thanks</h3>
<ul>
<li>NAITOH Jun</li>
</ul>
<h2>REXML 3.3.8 - 2024-09-29</h2>
<h3>Improvements</h3>
<ul>
<li>SAX2: Improve parse performance.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/207">GH-207</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
</ul>
<h3>Fixes</h3>
<ul>
<li>Fixed a bug that unexpected attribute namespace conflict error for
the predefined &quot;xml&quot; namespace is reported.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/208">GH-208</a></li>
<li>Patch by KITAITI Makoto</li>
</ul>
</li>
</ul>
<h3>Thanks</h3>
<ul>
<li>
<p>NAITOH Jun</p>
</li>
<li>
<p>KITAITI Makoto</p>
</li>
</ul>
<h2>REXML 3.3.7 - 2024-09-04</h2>
<h3>Improvements</h3>
<ul>
<li>Added local entity expansion limit methods
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/192">GH-192</a></li>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/202">GH-202</a></li>
<li>Reported by takuya kodama.</li>
</ul>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/rexml/blob/master/NEWS.md">rexml's
changelog</a>.</em></p>
<blockquote>
<h2>3.3.9 - 2024-10-24 {#version-3-3-9}</h2>
<h3>Improvements</h3>
<ul>
<li>Improved performance.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/210">GH-210</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
</ul>
<h3>Fixes</h3>
<ul>
<li>
<p>Fixed a parse bug for text only invalid XML.</p>
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/215">GH-215</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
<li>
<p>Fixed a parse bug that <code>&amp;#0x...;</code> is accepted as a
character
reference.</p>
</li>
</ul>
<h3>Thanks</h3>
<ul>
<li>NAITOH Jun</li>
</ul>
<h2>3.3.8 - 2024-09-29 {#version-3-3-8}</h2>
<h3>Improvements</h3>
<ul>
<li>SAX2: Improve parse performance.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/207">GH-207</a></li>
<li>Patch by NAITOH Jun.</li>
</ul>
</li>
</ul>
<h3>Fixes</h3>
<ul>
<li>Fixed a bug that unexpected attribute namespace conflict error for
the predefined &quot;xml&quot; namespace is reported.
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/208">GH-208</a></li>
<li>Patch by KITAITI Makoto</li>
</ul>
</li>
</ul>
<h3>Thanks</h3>
<ul>
<li>
<p>NAITOH Jun</p>
</li>
<li>
<p>KITAITI Makoto</p>
</li>
</ul>
<h2>3.3.7 - 2024-09-04 {#version-3-3-7}</h2>
<h3>Improvements</h3>
<ul>
<li>Added local entity expansion limit methods
<ul>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/192">GH-192</a></li>
<li><a
href="https://redirect.github.com/ruby/rexml/issues/202">GH-202</a></li>
<li>Reported by takuya kodama.</li>
</ul>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/rexml/commit/38eaa86ac7abe0d31cf49d8df57ad239fdeb80e9"><code>38eaa86</code></a>
Add 3.3.9 entry</li>
<li><a
href="https://github.com/ruby/rexml/commit/ce59f2eb1aeb371fe1643414f06618dbe031979f"><code>ce59f2e</code></a>
parser: fix a bug that &amp;#0x...; is accepted as a character
reference</li>
<li><a
href="https://github.com/ruby/rexml/commit/a09646d395a07399cbf9bc3bc8d6d8bb1d13ecea"><code>a09646d</code></a>
test: fix indent</li>
<li><a
href="https://github.com/ruby/rexml/commit/cf0fb9c9ca3dc0d725c8e4644aa0e728025f42ce"><code>cf0fb9c</code></a>
Fix <code>IOSource#readline</code> for <code>@pending_buffer</code> (<a
href="https://redirect.github.com/ruby/rexml/issues/215">#215</a>)</li>
<li><a
href="https://github.com/ruby/rexml/commit/1d0c362526f6e25e2abcd13e2fcefcc718c20e78"><code>1d0c362</code></a>
Optimize <code>IOSource#read_until</code> method (<a
href="https://redirect.github.com/ruby/rexml/issues/210">#210</a>)</li>
<li><a
href="https://github.com/ruby/rexml/commit/622011f25ac1519fd553d6c56da52d7eba14a787"><code>622011f</code></a>
Bump version</li>
<li><a
href="https://github.com/ruby/rexml/commit/036d50851ce091c797db0b9ba3ed8e5a39c3918c"><code>036d508</code></a>
test: avoid using needless non ASCII characters</li>
<li><a
href="https://github.com/ruby/rexml/commit/4197054a19e65511fb51983518a134a5c65aa840"><code>4197054</code></a>
Add 3.3.8 entry</li>
<li><a
href="https://github.com/ruby/rexml/commit/78f8712dccad773a51dc5eef31c02d523e994570"><code>78f8712</code></a>
Fix handling with &quot;xml:&quot; prefixed namespace (<a
href="https://redirect.github.com/ruby/rexml/issues/208">#208</a>)</li>
<li><a
href="https://github.com/ruby/rexml/commit/2e1cd64f2f9c0667a840a0e31f9bb99f9e1c2b33"><code>2e1cd64</code></a>
Optimize SAX2Parser#get_namespace (<a
href="https://redirect.github.com/ruby/rexml/issues/207">#207</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/ruby/rexml/compare/v3.3.6...v3.3.9">compare
view</a></li>
</ul>
</details>
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docs/Gemfile.lock

@@ -60,15 +60,13 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rouge (4.2.0)
     safe_yaml (1.0.5)
     sass-embedded (1.69.7-arm64-darwin)
       google-protobuf (~> 3.25)
     sass-embedded (1.69.7-x86_64-linux-gnu)
       google-protobuf (~> 3.25)
-    strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.5.0)