build(deps-dev): bump nokogiri from 1.18.3 to 1.18.8 in /docs in the bundler group across 1 directory (#13243)

Bumps the bundler group with 1 update in the /docs directory:
[nokogiri](https://github.com/sparklemotion/nokogiri).

Updates `nokogiri` from 1.18.3 to 1.18.8
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sparklemotion/nokogiri/releases">nokogiri's
releases</a>.</em></p>
<blockquote>
<h2>v1.18.8 / 2025-04-21</h2>
<h3>Security</h3>
<ul>
<li>[CRuby] Vendored libxml2 is updated to <a
href="https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.8">v2.13.8</a>
to address CVE-2025-32414 and CVE-2025-32415. See <a
href="https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5w6v-399v-w3cc">GHSA-5w6v-399v-w3cc</a>
for more information.</li>
</ul>
<!-- raw HTML omitted -->

<pre><code>36badd2eb281fca6214a5188e24a34399b15d89730639a068d12931e2adc210e
nokogiri-1.18.8-aarch64-linux-gnu.gem
664e0f9a77a7122a66d6c03abba7641ca610769a4728db55ee1706a0838b78a2
nokogiri-1.18.8-aarch64-linux-musl.gem
483b5b9fb33653f6f05cbe00d09ea315f268f0e707cfc809aa39b62993008212
nokogiri-1.18.8-arm64-darwin.gem
17de01ca3adf9f8e187883ed73c672344d3dbb3c260f88ffa1008e8dc255a28e
nokogiri-1.18.8-arm-linux-gnu.gem
6e6d7e71fc39572bd613a82d528cf54392c3de1ba5ce974f05c832b8187a040b
nokogiri-1.18.8-arm-linux-musl.gem
8c7464875d9ca7f71080c24c0db7bcaa3940e8be3c6fc4bcebccf8b9a0016365
nokogiri-1.18.8.gem
41002596960ff854198a20aaeb34cff0d445406d5ad85ba7ca9c3fd0c8f03de0
nokogiri-1.18.8-java.gem
11ab0f76772c5f2d718fb253fca5b74c6ef7628b72bbf8deba6ab1ffc93344cf
nokogiri-1.18.8-x64-mingw-ucrt.gem
024cdfe7d9ae3466bba6c06f348fb2a8395d9426b66a3c82f1961b907945cc0c
nokogiri-1.18.8-x86_64-darwin.gem
4a747875db873d18a2985ee2c320a6070c4a414ad629da625fbc58d1a20e5ecc
nokogiri-1.18.8-x86_64-linux-gnu.gem
ddd735fba49475a395b9ea793bb6474e3a3125b89960339604d08a5397de1165
nokogiri-1.18.8-x86_64-linux-musl.gem
</code></pre>
<h2>v1.18.7 / 2025-03-31</h2>
<h3>Dependencies</h3>
<ul>
<li>[CRuby] Vendored libxml2 is updated to <a
href="https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.7">v2.13.7</a>,
which is a bugfix release.</li>
</ul>
<!-- raw HTML omitted -->

<pre><code>57a064ab5440814a69a0e040817bd8154adea68a30d2ff2b3aa515a6a06dbb5f
nokogiri-1.18.7-aarch64-linux-gnu.gem
3e442dc5b69376e84288295fe37cbb890a21ad816a7e571e5e9967b3c1e30cd3
nokogiri-1.18.7-aarch64-linux-musl.gem
083abb2e9ed2646860f6b481a981485a658c6064caafaa81bf1cda1bada2e9d5
nokogiri-1.18.7-arm64-darwin.gem
337d9149deb5ae01022dff7c90f97bed81715fd586aacab0c5809ef933994c5e
nokogiri-1.18.7-arm-linux-gnu.gem
97a26edcc975f780a0822aaf7f7d7427c561067c1c9ee56bd3542960f0c28a6e
nokogiri-1.18.7-arm-linux-musl.gem
6b63ff5defe48f30d1d3b3122f65255ca91df2caf5378c6e0482ce73ff46fb31
nokogiri-1.18.7.gem
2cb83666f35619ec59d24d831bf492e49cfe27b112c222330ee929737f42f2eb
nokogiri-1.18.7-java.gem
681148fbc918aa5d54933d8b48aeb9462ab708d23409797ed750af961107f72b
nokogiri-1.18.7-x64-mingw-ucrt.gem
081d1aa517454ba3415304e2ea51fe411d6a3a809490d0c4aa42799cada417b7
nokogiri-1.18.7-x86_64-darwin.gem
3a0bf946eb2defde13d760f869b61bc8b0c18875afdd3cffa96543cfa3a18005
nokogiri-1.18.7-x86_64-linux-gnu.gem
9d83f8ec1fc37a305fa835d7ee61a4f37899e6ccc6dcb05be6645fa9797605af
nokogiri-1.18.7-x86_64-linux-musl.gem
</code></pre>
<h2>v1.18.6 / 2025-03-24</h2>
<h3>Fixed</h3>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md">nokogiri's
changelog</a>.</em></p>
<blockquote>
<h2>v1.18.8 / 2025-04-21</h2>
<h3>Security</h3>
<ul>
<li>[CRuby] Vendored libxml2 is updated to <a
href="https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.8">v2.13.8</a>
to address CVE-2025-32414 and CVE-2025-32415. See <a
href="https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5w6v-399v-w3cc">GHSA-5w6v-399v-w3cc</a>
for more information.</li>
</ul>
<h2>v1.18.7 / 2025-03-31</h2>
<h3>Dependencies</h3>
<ul>
<li>[CRuby] Vendored libxml2 is updated to <a
href="https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.7">v2.13.7</a>,
which is a bugfix release.</li>
</ul>
<h2>v1.18.6 / 2025-03-24</h2>
<h3>Fixed</h3>
<ul>
<li>[JRuby] In HTML documents, <code>Node#attribute</code> now returns
the correct attribute. This has been broken, and returning
<code>nil</code>, since v1.17.0. (<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3487">#3487</a>)
<a
href="https://github.com/flavorjones"><code>@​flavorjones</code></a></li>
</ul>
<h2>v1.18.5 / 2025-03-19</h2>
<h3>Fixed</h3>
<ul>
<li>[JRuby] Update JRuby's XML serialization so it outputs namespaces
exactly like CRuby. (<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3455">#3455</a>,
<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3456">#3456</a>)
<a
href="https://github.com/johnnyshields"><code>@​johnnyshields</code></a></li>
</ul>
<h2>v1.18.4 / 2025-03-14</h2>
<h3>Security</h3>
<ul>
<li>[CRuby] Vendored libxslt is updated to <a
href="https://gitlab.gnome.org/GNOME/libxslt/-/releases/v1.1.43">v1.1.43</a>
to address CVE-2025-24855 and CVE-2024-55549. See <a
href="https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-mrxw-mxhj-p664">GHSA-mrxw-mxhj-p664</a>
for more information.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/9187f4af0dc3cc7ea439bd4957a2fbfab18f6665"><code>9187f4a</code></a>
version bump to v1.18.8</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/1deea041e3f359ccef67abadf19f0d634bf473dd"><code>1deea04</code></a>
dep: libxml2 to v2.13.8 (branch <code>v1.18.x</code>) (<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3509">#3509</a>)</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/6457fe639359edda9f8817994bc4935abae3e81e"><code>6457fe6</code></a>
dep: libxml2 to v2.13.8</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/13e8aa4ef52f39d1273d2435bd6bfa98982471ef"><code>13e8aa4</code></a>
version bump to v1.18.7</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/605699d271ee5d7f58ab29c4550fad42b9cc3d69"><code>605699d</code></a>
dep: bump libxml2 to 2.13.7 (v1.18.x backport) (<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3495">#3495</a>)</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/804e59038c4318ebe7ba0dc08105cff2030df415"><code>804e590</code></a>
dep: bump libxml2 to 2.13.7</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/52bf15b62d4e576292e21ac948030783333f9e0b"><code>52bf15b</code></a>
dep(dev): drop Rubocop from JRuby deps</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/189769d72627da5f272c7ffcc14cce49d60b9b5a"><code>189769d</code></a>
version bump to v1.18.6</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/de4982f0cc39995570f5d15d753577bede5804dc"><code>de4982f</code></a>
fix(jruby): Node#attribute in HTML documents (v1.18.x) (<a
href="https://redirect.github.com/sparklemotion/nokogiri/issues/3492">#3492</a>)</li>
<li><a
href="https://github.com/sparklemotion/nokogiri/commit/7d95b0f10cf33c505f11fd7d68d7de8943dda2cd"><code>7d95b0f</code></a>
fix(jruby): Node#attribute in HTML documents</li>
<li>Additional commits viewable in <a
href="https://github.com/sparklemotion/nokogiri/compare/v1.18.3...v1.18.8">compare
view</a></li>
</ul>
</details>
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docs/Gemfile.lock

@@ -210,7 +210,7 @@ GEM
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.19.0)
-    nokogiri (1.18.3-x86_64-linux-gnu)
+    nokogiri (1.18.8-x86_64-linux-gnu)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)