chore: unify zod versions in tests (#571)

Author: ymc9

tests/integration/tests/nextjs/test-project/package-lock.json

@@ -20,7 +20,7 @@
     "react-dom": "18.2.0",
     "swr": "^2.2.0",
     "typescript": "4.9.4",
-    "zod": "^3.21.1"
+    "zod": "3.21.1"
   },
   "devDependencies": {
     "prisma": "^4.7.0"