Bump react-native from 0.62.2 to 0.64.2 in /examples/sketch

Bumps [react-native](https://github.com/facebook/react-native) from 0.62.2 to 0.64.2.
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/main/Releases.md)
- [Commits](facebook/react-native@v0.62.2...v0.64.2)

---
updated-dependencies:
- dependency-name: react-native
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>