[Security] Bump react-dom from 16.2.0 to 16.2.1

Bumps [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom) from 16.2.0 to 16.2.1. **This update includes a security fix.**
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/HEAD/packages/react-dom

)

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