Bump rack-attack from 5.4.2 to 6.0.0 (#2567)
Bump rack-attack from 5.4.2 to 6.0.0 (#2567)

Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 5.4.2 to 6.0.0.
- [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/v5.4.2...v6.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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