fix(deps): update dependency @astrojs/cloudflare to v12

Author: renovate[bot]

package.json

@@ -23,7 +23,7 @@
   "dependencies": {
     "@astro-community/astro-embed-link-preview": "^0.2.2",
     "@astrojs/check": "^0.9.4",
-    "@astrojs/cloudflare": "^11.2.0",
+    "@astrojs/cloudflare": "^12.6.13",
     "@astrojs/mdx": "^3.1.8",
     "@astrojs/starlight": "^0.28.4",
     "astro": "^4.16.7",