chore: upgrade zod to v4.1.9

Author: felixweinberger

package-lock.json

@@ -73,7 +73,7 @@
         "express-rate-limit": "^7.5.0",
         "pkce-challenge": "^5.0.0",
         "raw-body": "^3.0.0",
-        "zod": "^3.23.8",
+        "zod": "^4.1.9",
         "zod-to-json-schema": "^3.24.1"
     },
     "devDependencies": {