Fix local state sharing example deps (#1737)

Author: huozhi

examples/local-state-sharing/package.json

@@ -4,6 +4,8 @@
   "main": "index.js",
   "license": "MIT",
   "dependencies": {
+    "react": "17.0.2",
+    "react-dom": "17.0.2",
     "next": "latest",
     "swr": "latest"
   },