Update rubocop-rails requirement from = 2.8.0 to = 2.8.1
Update rubocop-rails requirement from = 2.8.0 to = 2.8.1

Updates the requirements on [rubocop-rails](https://github.com/rubocop-hq/rubocop-rails) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rails/compare/v2.8.0...v2.8.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rainforestapp/rf-stylez,rainforestapp/rf-stylez