Update dependency @astrojs/cloudflare to v12

Author: renovate[bot]

package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.0",
-    "@astrojs/cloudflare": "^11.0.1",
+    "@astrojs/cloudflare": "^12.0.0",
     "@astrojs/mdx": "^4.0.0",
     "@astrojs/partytown": "^2.1.1",
     "@astrojs/rss": "^4.0.7",