Bump @csstools/selector-specificity from 2.1.0 to 2.1.1 (#6600)

Bumps [@csstools/selector-specificity](https://github.com/csstools/postcss-plugins/tree/HEAD/packages/selector-specificity) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/csstools/postcss-plugins/releases)
- [Changelog](https://github.com/csstools/postcss-plugins/blob/main/packages/selector-specificity/CHANGELOG.md)
- [Commits](https://github.com/csstools/postcss-plugins/commits/HEAD/packages/selector-specificity)

---
updated-dependencies:
- dependency-name: "@csstools/selector-specificity"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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package.json

@@ -114,7 +114,7 @@
     "@csstools/css-parser-algorithms": "^2.0.0",
     "@csstools/css-tokenizer": "^2.0.0",
     "@csstools/media-query-list-parser": "^2.0.1",
-    "@csstools/selector-specificity": "^2.1.0",
+    "@csstools/selector-specificity": "^2.1.1",
     "balanced-match": "^2.0.0",
     "colord": "^2.9.3",
     "cosmiconfig": "^8.0.0",