Update @babel/preset-env requirement from 7.5.5 to 7.6.0
Updates the requirements on [@babel/preset-env](https://github.com/babel/babel) to permit the latest version.
- [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/v7.5.5...v7.6.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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