chore: Node.js のバージョンを Vercel に合わせる

Author: sushichan044

package.json

@@ -84,7 +84,7 @@
     "vitest": "3.0.7"
   },
   "engines": {
-    "node": ">=20.0.0"
+    "node": "^22.0.0"
   },
   "packageManager": "[email protected]",
   "pnpm": {