dependabot/bundler/rack-1.6.12 Bump rack from 1.6.11 to 1.6.12

Bumps [rack](https://github.com/rack/rack) from 1.6.11 to 1.6.12.
- [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/1.6.11...1.6.12)

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

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