fix(deps): update dependency zod to v4

Author: descope[bot]

package.json

@@ -39,7 +39,7 @@
     "@descope/node-sdk": "^1.7.11",
     "@modelcontextprotocol/sdk": "^1.15.1",
     "express": "4.21.2",
-    "zod": "3.25.76"
+    "zod": "4.1.11"
   },
   "devDependencies": {
     "@eslint/js": "^9.24.0",