Update dependency zod to v4

renovate[bot] · web-flow · commit 50a376ee4b20 · 2025-12-31T12:42:25.000Z
diff --git a/package.json b/package.json
@@ -61,6 +61,6 @@
   "dependencies": {
     "@types/express": "^4.17.13",
     "express": "^4.18.1",
-    "zod": "^3.17.10"
+    "zod": "^4.0.0"
   }
 }
