chore: Update expo version for RN example. (#556)

Was experiencing the error here:
expo/expo#30898

Author: kinyoklion

packages/sdk/react-native/example/package.json

@@ -23,7 +23,7 @@
   "dependencies": {
     "@launchdarkly/react-native-client-sdk": "workspace:^",
     "@react-native-async-storage/async-storage": "^1.21.0",
-    "expo": "51.0.21",
+    "expo": "51.0.31",
     "expo-status-bar": "~1.11.1",
     "react": "18.2.0",
     "react-native": "0.74.3",