Bump postcss from 8.4.14 to 8.4.31 (#1703)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.14 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/8.4.14...8.4.31)

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

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package.json

@@ -73,7 +73,7 @@
     "lodash": "4.17.21",
     "mini-css-extract-plugin": "2.6.1",
     "moment": "2.29.4",
-    "postcss": "8.4.14",
+    "postcss": "8.4.31",
     "postcss-loader": "7.0.1",
     "postcss-reporter": "7.0.5",
     "postcss-scss": "4.0.4",