Bump rubocop from 0.59.2 to 0.60.0 (#9135)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.59.2 to 0.60.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.59.2...v0.60.0

)

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