Bump postcss from 8.4.25 to 8.4.26

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.25 to 8.4.26.
- [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/8.4.25...8.4.26)

---
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

@@ -10059,13 +10059,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.0.3, postcss@npm:^8.4.23":
-  version: 8.4.25
-  resolution: "postcss@npm:8.4.25"
+  version: 8.4.26
+  resolution: "postcss@npm:8.4.26"
   dependencies:
     nanoid: ^3.3.6
     picocolors: ^1.0.0
     source-map-js: ^1.0.2
-  checksum: 9ed3ab8af43ad5210c28f56f916fd9b8c9f94fbeaebbf645dcf579bc28bdd8056c2a7ecc934668d399b81fedb6128f0c4b299f931e50454964bc911c25a3a0a2
+  checksum: 1cf08ee10d58cbe98f94bf12ac49a5e5ed1588507d333d2642aacc24369ca987274e1f60ff4cbf0081f70d2ab18a5cd3a4a273f188d835b8e7f3ba381b184e57
   languageName: node
   linkType: hard