chore: update nextjs example.

Author: jaywcjlove

example/nextjs/package.json

@@ -9,15 +9,15 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
     "next": "15.3.1"
   },
   "devDependencies": {
     "typescript": "^5",
     "@types/node": "^20",
-    "@types/react": "^19",
-    "@types/react-dom": "^19",
+    "@types/react": "^18",
+    "@types/react-dom": "^18",
     "@tailwindcss/postcss": "^4",
     "tailwindcss": "^4"
   }