Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/kickstarter/rack-attack/releases)
- [Changelog](https://github.com/kickstarter/rack-attack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kickstarter/rack-attack/compare/v6.0.0...v6.1.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>