chore(deps-dev): bump postcss from 8.4.20 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.20 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@8.4.20...8.4.31)

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

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

package.json

@@ -193,7 +193,7 @@
     "jest-environment-jsdom": "^28.1.3",
     "lint-staged": "^13.0.3",
     "mini-css-extract-plugin": "^2.6.1",
-    "postcss": "^8.4.20",
+    "postcss": "^8.4.31",
     "postcss-loader": "^7.0.2",
     "prettier": "^2.7.1",
     "react-refresh": "^0.14.0",