fix(deps): update dependency postcss to v8.5.1

[skip netlify]

Author: renovate[bot]

apps/next-app/package.json

@@ -18,7 +18,7 @@
     "eslint": "9.13.0",
     "eslint-config-next": "15.0.1",
     "next": "15.0.1",
-    "postcss": "8.4.47",
+    "postcss": "8.5.1",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "tailwindcss": "3.4.14",