Bump rack-attack from 6.3.1 to 6.4.0 (#15628)

Bump rack-attack from 6.3.1 to 6.4.0 (#15628)

Bumps [rack-attack](https://github.com/rack/rack-attack) from 6.3.1 to 6.4.0.
- [Release notes](https://github.com/rack/rack-attack/releases)
- [Changelog](https://github.com/rack/rack-attack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack-attack/compare/v6.3.1...v6.4.0)

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