[Dependency] Bump json from 2.18.0 to 2.18.1 (#728)

Bumps [json](https://github.com/ruby/json) from 2.18.0 to 2.18.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/json/releases">json's
releases</a>.</em></p>
<blockquote>
<h2>v2.18.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix a potential crash in very specific circumstance if GC triggers
during a call to <code>to_json</code>
without first invoking a user defined <code>#to_json</code> method.</li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/json/compare/v2.18.0...v2.18.1">https://github.com/ruby/json/compare/v2.18.0...v2.18.1</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/json/blob/master/CHANGES.md">json's
changelog</a>.</em></p>
<blockquote>
<h3>2026-02-03 (2.18.1)</h3>
<ul>
<li>Fix a potential crash in very specific circumstance if GC triggers
during a call to <code>to_json</code>
without first invoking a user defined <code>#to_json</code> method.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/json/commit/6ec6e7baff137e67831a23090061e84bf028dbfc"><code>6ec6e7b</code></a>
Release 2.18.1</li>
<li><a
href="https://github.com/ruby/json/commit/fff25c9f4b9c590a59ed4a2ec3c545121db844d3"><code>fff25c9</code></a>
fbuffer_append_str: assume string</li>
<li><a
href="https://github.com/ruby/json/commit/79b6e168ba02f6ac7a0dac378968b1c918af91db"><code>79b6e16</code></a>
Ensure <code>Generator::State</code> is kept on the stack</li>
<li><a
href="https://github.com/ruby/json/commit/062fcdd22818d226f0e4b49647eb2aabbfaf002b"><code>062fcdd</code></a>
Improve class JSON intro</li>
<li><a
href="https://github.com/ruby/json/commit/1b276c8623da0ff9bec62396d9a7172365bc1784"><code>1b276c8</code></a>
Extract json_fast_memcpy16 for readability</li>
<li><a
href="https://github.com/ruby/json/commit/643ee11fed6898b7e6f75f266daa6e4b2a07bb07"><code>643ee11</code></a>
Use __builtin_memcpy, if available, to copy overlapping byte ranges in
copy_r...</li>
<li><a
href="https://github.com/ruby/json/commit/15eb40dbdfb299813bbbb72f70e12d1614b26200"><code>15eb40d</code></a>
Remove trailing spaces [ci skip]</li>
<li><a
href="https://github.com/ruby/json/commit/73818b80c8fe4394153002a60ecd285e8688b4cd"><code>73818b8</code></a>
initialize search.chunk_end to silence a warning about it being
potentially u...</li>
<li><a
href="https://github.com/ruby/json/commit/86a5cce405102eca15d639e2dae2f539fb3e7c26"><code>86a5cce</code></a>
use a conditional to select SIMD implementation rather than pointer</li>
<li><a
href="https://github.com/ruby/json/commit/a51317c94900ec5ea44ef0fd9327cca4d601bb5c"><code>a51317c</code></a>
Directly write to the output buffer when converting UTF32 to UTF8.</li>
<li>Additional commits viewable in <a
href="https://github.com/ruby/json/compare/v2.18.0...v2.18.1">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile.lock

@@ -220,7 +220,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    json (2.18.0)
+    json (2.18.1)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)