Build(deps): Bump postcss from 8.4.23 to 8.4.31 (#565)

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:production
...

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package.json

@@ -30,7 +30,7 @@
     "moment": "^2.29.4",
     "node-sass": "^9.0.0",
     "popper.js": "^1.16.1",
-    "postcss": "^8.4.5",
+    "postcss": "^8.4.31",
     "uglify-js": "^3.14.5"
   },
   "devDependencies": {