Update dependency postcss-cli to v11

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "@fullhuman/postcss-purgecss": "^1.2.0",
     "autoprefixer": "^9.6.0",
-    "postcss-cli": "^6.1.2",
+    "postcss-cli": "^11.0.0",
     "postcss-import": "^12.0.1",
     "postcss-purifycss": "^1.1.0",
     "postcss-replace": "^1.0.6",