Bump @babel/preset-env from 7.8.6 to 7.8.7 in /website (#7712)
Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.8.6 to 7.8.7.
- [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/v7.8.6...v7.8.7)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
