fix: downgrade which to v5 for Node >=20.0.0 compatibility

Author: marcusolsson

package-lock.json

@@ -73,7 +73,7 @@
     "openapi-typescript": "^7.13.0",
     "openid-client": "^6.8.4",
     "readline": "^1.3.0",
-    "which": "^6.0.1",
+    "which": "^5.0.0",
     "zod": "^4.1.12"
   },
   "lint-staged": {