Build(deps-dev): Bump postcss from 8.4.30 to 8.4.31 (#1827)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -132,7 +132,7 @@
     "indexeddb-export-import": "^2.1.5",
     "loader.js": "^4.7.0",
     "nearest-color": "^0.4.4",
-    "postcss": "^8.4.30",
+    "postcss": "^8.4.31",
     "postcss-scss": "^4.0.8",
     "prettier": "^2.8.7",
     "qunit": "^2.19.4",