chore(deps-dev): bump postcss from 8.4.30 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.30 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@8.4.30...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -171,7 +171,7 @@
     "npm-run-all": "^4.1.5",
     "oauth2-server": "^2.4.1",
     "open": "^9.1.0",
-    "postcss": "^8.4.30",
+    "postcss": "^8.4.31",
     "postcss-loader": "^7.3.0",
     "postcss-preset-env": "^9.1.4",
     "prettier": "^3.0.3",