Update dependency ruby-openai to v6.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ruby-openai (changelog)	'6.0.1' -> '6.1.0'

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Release Notes

alexrudall/ruby-openai (ruby-openai)

### [`v6.1.0`](https://togithub.com/alexrudall/ruby-openai/blob/HEAD/CHANGELOG.md#610---2023-11-14) [Compare Source](https://togithub.com/alexrudall/ruby-openai/compare/v6.0.1...v6.1.0) ##### Added - Add support for Assistants, Threads, Messages and Runs. Thank you [@​Haegin](https://togithub.com/Haegin) for the excellent work on this PR, and many reviewers for their contributions!

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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[yegor256]

@rultor please, try to merge, since 1 checks have passed

[rultor]

@rultor please, try to merge, since 1 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 1 checks have passed

@yegor256 Done! FYI, the full log is here (took me 6min)