Bumps [sebastian/environment](https://github.com/sebastianbergmann/environment) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/sebastianbergmann/environment/releases)
- [Changelog](https://github.com/sebastianbergmann/environment/blob/master/ChangeLog.md)
- [Commits](https://github.com/sebastianbergmann/environment/compare/4.1.0...4.2.1

)

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