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>

package-lock.json

@@ -79,7 +79,7 @@
         "loader.js": "^4.7.0",
         "monaco-editor": "^0.34.0",
         "monaco-editor-webpack-plugin": "^7.0.1",
-        "postcss": "^8.4.16",
+        "postcss": "^8.4.31",
         "postcss-loader": "^7.0.1",
         "postcss-mixins": "^9.0.4",
         "prettier": "^2.8.7",
@@ -23700,9 +23700,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.23",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.23.tgz",
-      "integrity": "sha512-bQ3qMcpF6A/YjR55xtoTr0jGOlnPOKAIMdOWiv0EIT6HVPEaJiJB4NLljSbiHoC2RX7DN5Uvjtpbg1NPdwv1oA==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "funding": [
         {

package.json

@@ -102,7 +102,7 @@
     "loader.js": "^4.7.0",
     "monaco-editor": "^0.34.0",
     "monaco-editor-webpack-plugin": "^7.0.1",
-    "postcss": "^8.4.16",
+    "postcss": "^8.4.31",
     "postcss-loader": "^7.0.1",
     "postcss-mixins": "^9.0.4",
     "prettier": "^2.8.7",