chore(deps): update pnpm to >=9.12.0

Author: renovate[bot]

packages/mercurius-codegen/package.json

@@ -79,6 +79,6 @@
     "prettier": "^3.3.3"
   },
   "engines": {
-    "pnpm": ">=9.11.0"
+    "pnpm": ">=9.12.0"
   }
 }