chore(deps): update dependency postcss to v8.5.6

Author: renovate[bot]

package.json

@@ -116,7 +116,7 @@
     "@vue/compiler-sfc": "3.5.13",
     "cors": "2.8.5",
     "lint-staged": "15.3.0",
-    "postcss": "8.4.49",
+    "postcss": "8.5.6",
     "postcss-nested": "7.0.2",
     "postcss-preset-env": "10.1.3",
     "prettier": "3.4.2",