chore(deps-dev): bump postcss from 8.4.6 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.6 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@8.4.6...8.4.31)

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

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

package.json

@@ -183,7 +183,7 @@
 		"mini-css-extract-plugin": "^1.6.2",
 		"mocha-junit-reporter": "^2.0.2",
 		"ora": "^4.0.2",
-		"postcss": "^8.4.6",
+		"postcss": "^8.4.31",
 		"postcss-loader": "^4.3.0",
 		"rimraf": "^3.0.2",
 		"sass": "^1.32.13",