build(deps-dev): bump postcss from 8.4.29 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.29 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@8.4.29...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

packages/frontend/package.json

@@ -32,7 +32,7 @@
     "eslint-plugin-react": "^7.31.10",
     "eslint-plugin-react-hooks": "^4.6.0",
     "eslint-plugin-unused-imports": "^2.0.0",
-    "postcss": "^8.4.21",
+    "postcss": "^8.4.31",
     "prettier": "^2.8.4",
     "tailwindcss": "^3.2.6",
     "typescript": "^4.9.3",

yarn.lock

@@ -4958,7 +4958,7 @@ __metadata:
     eslint-plugin-react-hooks: ^4.6.0
     eslint-plugin-unused-imports: ^2.0.0
     lodash: ^4.17.21
-    postcss: ^8.4.21
+    postcss: ^8.4.31
     prettier: ^2.8.4
     react: ^18.2.0
     react-dom: ^18.2.0
@@ -10841,7 +10841,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.4.21, postcss@npm:^8.4.23, postcss@npm:^8.4.27":
+"postcss@npm:^8.4.23, postcss@npm:^8.4.27":
   version: 8.4.29
   resolution: "postcss@npm:8.4.29"
   dependencies:
@@ -10852,6 +10852,17 @@ __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
+
 "postgres-array@npm:~2.0.0":
   version: 2.0.0
   resolution: "postgres-array@npm:2.0.0"