chore(deps-dev): bump postcss from 8.4.14 to 8.4.31

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](postcss/postcss@8.4.14...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -72,7 +72,7 @@
     "identity-obj-proxy": "3.0.0",
     "jest": "27.5.1",
     "markuplint": "2.8.0",
-    "postcss": "8.4.14",
+    "postcss": "8.4.31",
     "postcss-scss": "4.0.4",
     "prettier": "2.7.0",
     "puppeteer": "13.7.0",