Bump cross-env from 5.2.1 to 6.0.0 ( 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]