Update postcss in peer dependencies

Author: ai

package.json

@@ -38,7 +38,7 @@
     "url": "https://opencollective.com/postcss/"
   },
   "peerDependencies": {
-    "postcss": "^8.3.3"
+    "postcss": "^8.4.21"
   },
   "dependencies": {
     "camelcase-css": "^2.0.1"