Bump docker-ruby from 2ba928a to 59bb4e0 (#6)

Bumps [docker-ruby](https://github.com/docker-library/ruby) from `2ba928a` to `59bb4e0`.
- [Commits](docker-library/ruby@2ba928a...59bb4e0)

---
updated-dependencies:
- dependency-name: docker-ruby
  dependency-type: direct:production
...

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