Update ruby
Update ruby

Changes:

- https://github.com/docker-library/ruby/commit/f375798: Merge pull request https://github.com/docker-library/ruby/pull/381 from ojab/bump-rubies
- https://github.com/docker-library/ruby/commit/6a10000: Update 3.1 to 3.1.2
- https://github.com/docker-library/ruby/commit/dd1b1c9: Update 3.0 to 3.0.4
- https://github.com/docker-library/ruby/commit/2c3e1e0: Update 2.7 to 2.7.6
- https://github.com/docker-library/ruby/commit/b633eef: Update 2.6 to 2.6.10

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