Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 5.2.1 to 6.0.0.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kentcdodds/cross-env/compare/v5.2.1...v6.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>