Bump postcss from 8.4.18 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.18 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.18...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

yarn.lock

@@ -16983,7 +16983,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.1.31, nanoid@npm:^3.3.4":
+"nanoid@npm:^3.1.31, nanoid@npm:^3.3.6":
   version: 3.3.6
   resolution: "nanoid@npm:3.3.6"
   bin:
@@ -18565,13 +18565,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.2.15, postcss@npm:^8.2.9, postcss@npm:^8.3.11":
-  version: 8.4.18
-  resolution: "postcss@npm:8.4.18"
+  version: 8.4.31
+  resolution: "postcss@npm:8.4.31"
   dependencies:
-    nanoid: ^3.3.4
+    nanoid: ^3.3.6
     picocolors: ^1.0.0
     source-map-js: ^1.0.2
-  checksum: 9349fd99849b2e3d2e134ff949b7770ecb12375f352723ce2bcc06167eba3850ea7844c1b191a85cd915d6a396b4e8ee9a5267e6cc5d8d003d0cbc7a97555d39
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
   languageName: node
   linkType: hard