Bump @babel/preset-react from 7.9.1 to 7.9.4 in /website (#7870)
Bumps [@babel/preset-react](https://github.com/babel/babel) from 7.9.1 to 7.9.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.9.1...v7.9.4)
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