Bump postcss from 8.4.19 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.19 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@8.4.19...8.4.31)

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

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

package.json

@@ -14,7 +14,7 @@
     "laravel-mix": "^6.0.6",
     "lodash": "^4.17.19",
     "node-gyp": "^9.3.1",
-    "postcss": "^8.1",
+    "postcss": "^8.4",
     "sass": "^1.17.3",
     "sass-loader": "^10.0.3",
     "vue": "^2.6.10",

yarn.lock

@@ -5245,6 +5245,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nanoid@npm:^3.3.6":
+  version: 3.3.6
+  resolution: "nanoid@npm:3.3.6"
+  bin:
+    nanoid: bin/nanoid.cjs
+  checksum: 7d0eda657002738aa5206107bd0580aead6c95c460ef1bdd0b1a87a9c7ae6277ac2e9b945306aaa5b32c6dcb7feaf462d0f552e7f8b5718abfc6ead5c94a71b3
+  languageName: node
+  linkType: hard
+
 "negotiator@npm:0.6.3, negotiator@npm:^0.6.3":
   version: 0.6.3
   resolution: "negotiator@npm:0.6.3"
@@ -6102,7 +6111,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.1, postcss@npm:^8.2.15, postcss@npm:^8.4.14":
+"postcss@npm:^8.2.15, postcss@npm:^8.4.14":
   version: 8.4.19
   resolution: "postcss@npm:8.4.19"
   dependencies:
@@ -6113,6 +6122,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"postcss@npm:^8.4":
+  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
+
 "prettier@npm:^1.18.2 || ^2.0.0":
   version: 2.8.0
   resolution: "prettier@npm:2.8.0"
@@ -6522,7 +6542,7 @@ __metadata:
     laravel-mix: ^6.0.6
     lodash: ^4.17.19
     node-gyp: ^9.3.1
-    postcss: ^8.1
+    postcss: ^8.4
     sass: ^1.17.3
     sass-loader: ^10.0.3
     vue: ^2.6.10