Update dependency zod to v4

Author: renovate[bot]

package.json

@@ -53,7 +53,7 @@
     "@types/omelette": "^0.4.4",
     "commander": "^14.0.0",
     "picocolors": "^1.0.1",
-    "zod": "^3.25.3",
+    "zod": "^4.0.0",
     "zod-to-json-schema": "^3.23.0"
   },
   "devDependencies": {