Bump react-native from 0.59.4 to 0.62.3 in /example

Bumps [react-native](https://github.com/facebook/react-native) from 0.59.4 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@v0.59.4...v0.62.3)

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

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

example/package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "react": "16.8.3",
-    "react-native": "0.59.4",
+    "react-native": "0.62.3",
     "react-native-sha256": "file:./.."
   },
   "devDependencies": {