fix: example/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116

Author: snyk-bot

example/package.json

@@ -13,7 +13,7 @@
   "dependencies": {
     "@react-native/new-app-screen": "0.83.0",
     "react": "19.2.3",
-    "react-native": "0.83.0",
+    "react-native": "0.84.0",
     "react-native-nitro-modules": "0.31.10",
     "react-native-safe-area-context": "^5.6.2"
   },