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] <[email protected]>

Author: dependabot[bot]

example/package.json

@@ -9,7 +9,7 @@
     },
     "dependencies": {
         "react": "16.8.3",
-        "react-native": "0.59.4",
+        "react-native": "0.62.3",
         "react-native-ble-manager": "6.6.2",
         "react-native-nordic-dfu": "file:../",
         "rn-fetch-blob": "^0.10.12"