build(deps-dev): bump postcss from 8.4.24 to 8.4.31 (#278)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.24 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@8.4.24...8.4.31)

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

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package.json

@@ -60,7 +60,7 @@
     "jest": "^26.6.3",
     "mini-css-extract-plugin": "^2.7.6",
     "patch-package": "^6.4.7",
-    "postcss": "^8.4.24",
+    "postcss": "^8.4.31",
     "postcss-loader": "^7.3.3",
     "process": "^0.11.10",
     "react-test-renderer": "^17.0.2",