Bump rspec-retry from 0.5.6 to 0.5.7 in /Library/Homebrew/test

Bumps [rspec-retry](https://github.com/noredink/rspec-retry) from 0.5.6 to 0.5.7.
- [Release notes](https://github.com/noredink/rspec-retry/releases)
- [Changelog](https://github.com/NoRedInk/rspec-retry/blob/master/changelog.md)
- [Commits](https://github.com/noredink/rspec-retry/compare/v0.5.6...v0.5.7

)

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