Bump react-native from 0.63.3 to 0.63.4

Bumps [react-native](https://github.com/facebook/react-native) from 0.63.3 to 0.63.4.
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/master/Releases.md)
- [Commits](facebook/react-native@v0.63.3...v0.63.4)

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