dependabot/bundler/rack-2.0.8 Bump rack from 2.0.5 to 2.0.8

Bumps [rack](https://github.com/rack/rack) from 2.0.5 to 2.0.8.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/2.0.5...2.0.8)

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