Bump cross-env from 6.0.3 to 7.0.2 (#13228)

Bump cross-env from 6.0.3 to 7.0.2 (#13228)

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.3 to 7.0.2.
- [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/v6.0.3...v7.0.2)

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