Update dependency postcss to ^8.4.28

Author: renovate[bot]

package-lock.json

@@ -17,7 +17,7 @@
     "autoprefixer": "^10.4.15",
     "nuxt": "^3.6.5",
     "nuxt-icon": "^0.5.0",
-    "postcss": "^8.4.27",
+    "postcss": "^8.4.28",
     "prettier": "^3.0.1",
     "tailwindcss": "^3.3.3"
   },