Merge pull request #2019 from ably/dependabot/npm_and_yarn/postcss-8.4.31

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

Author: kennethkalmer

package-lock.json

@@ -120,7 +120,7 @@
     "jest-environment-jsdom": "^29.3.1",
     "lint-staged": "^13.1.0",
     "msw": "^0.49.2",
-    "postcss": "^8.4.20",
+    "postcss": "^8.4.31",
     "postcss-import": "^15.1.0",
     "react-refresh": "^0.14.0",
     "react-test-renderer": "^18.2.0",