Bump react-native from 0.59.8 to 0.62.3 in /example

Bumps [react-native](https://github.com/facebook/react-native) from 0.59.8 to 0.62.3.
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/main/Releases.md)
- [Commits](facebook/react-native@v0.59.8...v0.62.3)

---
updated-dependencies:
- dependency-name: react-native
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

example/package.json

@@ -9,7 +9,7 @@
     "expo": "^34.0.1",
     "react": "16.8.3",
     "react-dom": "^16.8.6",
-    "react-native": "0.59.8",
+    "react-native": "0.62.3",
     "react-native-background-timer": "^2.1.1",
     "react-native-callkeep": "3.0.7",
     "react-native-device-info": "^2.3.2",