chore(deps-dev): Bump stylelint from 16.20.0 to 16.21.0 (#1237)

Bumps [stylelint](https://github.com/stylelint/stylelint) from 16.20.0
to 16.21.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/stylelint/stylelint/releases">stylelint's
releases</a>.</em></p>
<blockquote>
<h2>16.21.0</h2>
<p>It rounds out the <code>message</code> secondary option and marks it
as stable, adds 1 new option to a rule, and fixes 4 bugs.</p>
<ul>
<li>Added: non-experimental support for functional <code>message</code>
secondary option (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8595">#8595</a>)
(<a
href="https://github.com/ybiquitous"><code>@​ybiquitous</code></a>).</li>
<li>Added: <code>ignore: [&quot;after-custom-property&quot;]</code> to
<code>custom-property-empty-line-before</code> (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8627">#8627</a>)
(<a href="https://github.com/imkesin"><code>@​imkesin</code></a>).</li>
<li>Fixed: <code>cache</code> configuration property not being respected
(<a
href="https://redirect.github.com/stylelint/stylelint/issues/8599">#8599</a>)
(<a
href="https://github.com/ybiquitous"><code>@​ybiquitous</code></a>).</li>
<li>Fixed: <code>fastest-levenshtein</code> import when bundling (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8621">#8621</a>)
(<a
href="https://github.com/onigoetz"><code>@​onigoetz</code></a>).</li>
<li>Fixed: <code>named-grid-areas-no-invalid</code> false positives for
interpolated grid-template-areas in CSS-in-JS (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8606">#8606</a>)
(<a
href="https://github.com/shahana308"><code>@​shahana308</code></a>).</li>
<li>Fixed: <code>selector-pseudo-*-no-unknown</code> false positives for
the missing form control styling selectors (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8623">#8623</a>)
(<a
href="https://github.com/tyrann0us"><code>@​tyrann0us</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md">stylelint's
changelog</a>.</em></p>
<blockquote>
<h2>16.21.0 - 2025-06-19</h2>
<p>It rounds out the <code>message</code> secondary option and marks it
as stable, adds 1 new option to a rule, and fixes 4 bugs.</p>
<ul>
<li>Added: non-experimental support for functional <code>message</code>
secondary option (<a
href="https://redirect.github.com/stylelint/stylelint/pull/8595">#8595</a>)
(<a
href="https://github.com/ybiquitous"><code>@​ybiquitous</code></a>).</li>
<li>Added: <code>ignore: [&quot;after-custom-property&quot;]</code> to
<code>custom-property-empty-line-before</code> (<a
href="https://redirect.github.com/stylelint/stylelint/pull/8627">#8627</a>)
(<a href="https://github.com/imkesin"><code>@​imkesin</code></a>).</li>
<li>Fixed: <code>cache</code> configuration property not being respected
(<a
href="https://redirect.github.com/stylelint/stylelint/pull/8599">#8599</a>)
(<a
href="https://github.com/ybiquitous"><code>@​ybiquitous</code></a>).</li>
<li>Fixed: <code>fastest-levenshtein</code> import when bundling (<a
href="https://redirect.github.com/stylelint/stylelint/pull/8621">#8621</a>)
(<a
href="https://github.com/onigoetz"><code>@​onigoetz</code></a>).</li>
<li>Fixed: <code>named-grid-areas-no-invalid</code> false positives for
interpolated grid-template-areas in CSS-in-JS (<a
href="https://redirect.github.com/stylelint/stylelint/pull/8606">#8606</a>)
(<a
href="https://github.com/shahana308"><code>@​shahana308</code></a>).</li>
<li>Fixed: <code>selector-pseudo-*-no-unknown</code> false positives for
the missing form control styling selectors (<a
href="https://redirect.github.com/stylelint/stylelint/pull/8623">#8623</a>)
(<a
href="https://github.com/tyrann0us"><code>@​tyrann0us</code></a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="90ffc0bd8e"><code>90ffc0b</code></a>
16.21.0</li>
<li><a
href="e34a2a3aef"><code>e34a2a3</code></a>
Prepare 16.21.0 (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8598">#8598</a>)</li>
<li><a
href="18c9d63803"><code>18c9d63</code></a>
Fix <code>selector-pseudo-*-no-unknown</code> false positives for form
control styling s...</li>
<li><a
href="b006c58d52"><code>b006c58</code></a>
Fix <code>cache</code> configuration property not being respected (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8599">#8599</a>)</li>
<li><a
href="b764c238dc"><code>b764c23</code></a>
Fix <code>named-grid-areas-no-invalid</code> false positives for
interpolated grid-templ...</li>
<li><a
href="103c2d214b"><code>103c2d2</code></a>
Add <code>ignore: [&quot;after-custom-property&quot;]</code> to
`custom-property-empty-line-before...</li>
<li><a
href="1f9791bb67"><code>1f9791b</code></a>
Document <code>custom-property-empty-line-before</code> ignore examples
correctly (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8628">#8628</a>)</li>
<li><a
href="8a9a830ca8"><code>8a9a830</code></a>
Fix <code>fastest-levenshtein</code> import when bundling (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8621">#8621</a>)</li>
<li><a
href="651a1b43f6"><code>651a1b4</code></a>
Document notation typo fix (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8624">#8624</a>)</li>
<li><a
href="93d1af12d6"><code>93d1af1</code></a>
Bump known-css-properties from 0.36.0 to 0.37.0 (<a
href="https://redirect.github.com/stylelint/stylelint/issues/8619">#8619</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/stylelint/stylelint/compare/16.20.0...16.21.0">compare
view</a></li>
</ul>
</details>
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package.json

@@ -137,7 +137,7 @@
     "postcss": "^8.5.6",
     "react-hot-loader": "^4.13.1",
     "sass": "^1.89.2",
-    "stylelint": "^16.20.0",
+    "stylelint": "^16.21.0",
     "stylelint-config-recommended-scss": "^15.0.1",
     "stylelint-scss": "^6.12.1",
     "typescript": "^5.8.3",