chore(deps): update dependency postcss to ^8.5.3 (#13353)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

packages/vant-cli/package.json

@@ -60,7 +60,7 @@
     "markdown-it-anchor": "^9.2.0",
     "nano-staged": "^0.8.0",
     "picocolors": "^1.1.1",
-    "postcss": "^8.4.49",
+    "postcss": "^8.5.3",
     "postcss-load-config": "^6.0.1",
     "prettier": "^3.4.2",
     "rslog": "^1.2.3",