Bump rack-cache from 1.8.0 to 1.9.0
Bump rack-cache from 1.8.0 to 1.9.0

Bumps [rack-cache](https://github.com/rtomayko/rack-cache) from 1.8.0 to 1.9.0.
- [Release notes](https://github.com/rtomayko/rack-cache/releases)
- [Changelog](https://github.com/rtomayko/rack-cache/blob/master/CHANGES)
- [Commits](https://github.com/rtomayko/rack-cache/compare/v1.8.0...v1.9.0)

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