Bump postcss from 8.4.27 to 8.4.28

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.27 to 8.4.28.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.27...8.4.28)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

yarn.lock

@@ -10133,13 +10133,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.0.3, postcss@npm:^8.4.23":
-  version: 8.4.27
-  resolution: "postcss@npm:8.4.27"
+  version: 8.4.28
+  resolution: "postcss@npm:8.4.28"
   dependencies:
     nanoid: ^3.3.6
     picocolors: ^1.0.0
     source-map-js: ^1.0.2
-  checksum: 1cdd0c298849df6cd65f7e646a3ba36870a37b65f55fd59d1a165539c263e9b4872a402bf4ed1ca1bc31f58b68b2835545e33ea1a23b161a1f8aa6d5ded81e78
+  checksum: f605c24a36f7e400bad379735fbfc893ccb8d293ad6d419bb824db77cdcb69f43d614ef35f9f7091f32ca588d130ec60dbcf53b366e6bf88a8a64bbeb3c05f6d
   languageName: node
   linkType: hard