build: bump postcss from 8.2.1 to 8.2.4 (#21607)

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.1 to 8.2.4.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.2.1...8.2.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

yarn.lock

@@ -10245,9 +10245,9 @@ postcss@^5.2.16:
     supports-color "^3.2.3"
 
 postcss@^8.2.1:
-  version "8.2.1"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.1.tgz#eabc5557c4558059b9d9e5b15bce7ffa9089c2a8"
-  integrity sha512-RhsqOOAQzTgh1UB/IZdca7F9WDb7SUCR2Vnv1x7DbvuuggQIpoDwjK+q0rzoPffhYvWNKX5JSwS4so4K3UC6vA==
+  version "8.2.4"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.4.tgz#20a98a39cf303d15129c2865a9ec37eda0031d04"
+  integrity sha512-kRFftRoExRVXZlwUuay9iC824qmXPcQQVzAjbCCgjpXnkdMCJYBu2gTwAaFBzv8ewND6O8xFb3aELmEkh9zTzg==
   dependencies:
     colorette "^1.2.1"
     nanoid "^3.1.20"