fix(css): preserve whitespace in selectors when minifying css (#25767)

Resolves #25766

Author: sean-perkins

core/package-lock.json

@@ -54,7 +54,7 @@
     "@typescript-eslint/eslint-plugin": "^5.17.0",
     "@typescript-eslint/parser": "^5.17.0",
     "aws-sdk": "^2.738.0",
-    "clean-css-cli": "^4.1.11",
+    "clean-css-cli": "^5.6.1",
     "domino": "^2.1.6",
     "eslint": "^7.32.0",
     "eslint-config-prettier": "^8.5.0",