Update dependency postcss to v8.4.31 [SECURITY]

Author: renovate[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "@types/node": "18.11.9",
     "@types/react": "18.0.25",
     "autoprefixer": "10.4.13",
-    "postcss": "8.4.18",
+    "postcss": "8.4.31",
     "prisma": "4.6.1",
     "tailwindcss": "3.2.3",
     "ts-node": "10.9.1",