Bump postcss

Bumps  and [postcss](https://github.com/postcss/postcss). These dependencies needed to be updated together.

Updates `postcss` from 8.4.8 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@8.4.8...8.4.31)

Updates `postcss` from 8.4.14 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@8.4.8...8.4.31)

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

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

Author: dependabot[bot]

package-lock.json

@@ -4837,10 +4837,6 @@ mute-stream@0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
 
-nanoid@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.npmjs.org/nanoid/-/nanoid-3.3.1.tgz"
-
 nanoid@^3.3.6:
   version "3.3.6"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.6.tgz#443380c856d6e9f9824267d960b4236ad583ea4c"
@@ -5711,22 +5707,14 @@ postcss-values-parser@^6.0.2:
     is-url-superb "^4.0.0"
     quote-unquote "^1.0.0"
 
-postcss@^8.4.23:
+postcss@^8.4.23, postcss@^8.4.6:
   version "8.4.31"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
   dependencies:
     nanoid "^3.3.6"
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
-postcss@^8.4.6:
-  version "8.4.8"
-  resolved "https://registry.npmjs.org/postcss/-/postcss-8.4.8.tgz"
-  dependencies:
-    nanoid "^3.3.1"
-    picocolors "^1.0.0"
-    source-map-js "^1.0.2"
-
 precinct@^9.0.1:
   version "9.2.1"
   resolved "https://registry.yarnpkg.com/precinct/-/precinct-9.2.1.tgz#db0a67abff7b0a9a3b2b1ac33d170e8a5fcac7b2"