Update dependency postcss to v8.5.6

Author: renovate[bot]

package-lock.json

@@ -67,7 +67,7 @@
     "eslint": "8.56.0",
     "next-logger": "3.0.2",
     "np": "9.2.0",
-    "postcss": "8.4.33",
+    "postcss": "8.5.6",
     "prettier": "2.8.8",
     "sass": "1.70.0",
     "stylelint": "15.11.0",