Bump postcss from 8.4.23 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.23 to 8.4.31.
- [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/8.4.23...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

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

packages/stablestudio-ui/package.json

@@ -82,7 +82,7 @@
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-react": "^7.32.1",
     "eslint-plugin-react-hooks": "^4.6.0",
-    "postcss": "^8.4.21",
+    "postcss": "^8.4.31",
     "prettier": "^2.8.3",
     "prettier-plugin-tailwindcss": "^0.2.1",
     "rimraf": "^4.1.1",

yarn.lock

@@ -1310,7 +1310,7 @@ __metadata:
     lucide-react: ^0.105.0
     minisearch: ^6.0.0
     notistack: ^3.0.0-alpha.11
-    postcss: ^8.4.21
+    postcss: ^8.4.31
     prettier: ^2.8.3
     prettier-plugin-tailwindcss: ^0.2.1
     query-string: ^8.1.0
@@ -6153,7 +6153,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.4.21, postcss@npm:^8.4.23":
+"postcss@npm:^8.4.23":
   version: 8.4.23
   resolution: "postcss@npm:8.4.23"
   dependencies:
@@ -6164,6 +6164,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"postcss@npm:^8.4.31":
+  version: 8.4.31
+  resolution: "postcss@npm:8.4.31"
+  dependencies:
+    nanoid: ^3.3.6
+    picocolors: ^1.0.0
+    source-map-js: ^1.0.2
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
+  languageName: node
+  linkType: hard
+
 "prelude-ls@npm:^1.2.1":
   version: 1.2.1
   resolution: "prelude-ls@npm:1.2.1"