Update dependency postcss to ^8.4.5

Author: renovate-bot

package-lock.json

@@ -21,7 +21,7 @@
     "graphql": "^16.1.0",
     "next": "^12.0.7",
     "nprogress": "^0.2.0",
-    "postcss": "^8.4.4",
+    "postcss": "^8.4.5",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "react-hook-form": "^7.21.2",