build(deps-dev): bump postcss from 8.4.28 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.28 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/8.4.28...8.4.31)

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

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

package.json

@@ -29,7 +29,7 @@
     "eslint": "^8.47.0",
     "eslint-plugin-react": "^7.33.2",
     "eslint-plugin-react-hooks": "^4.6.0",
-    "postcss": "^8.4.28",
+    "postcss": "^8.4.31",
     "prop-types": "^15.8.1",
     "rollup": "^3.28.1",
     "sass": "^1.66.1",