Update dependency ruby-openai to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ruby-openai (changelog)	'5.2.0' -> '6.0.0'

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Release Notes

alexrudall/ruby-openai (ruby-openai)

### [`v6.0.0`](https://togithub.com/alexrudall/ruby-openai/blob/HEAD/CHANGELOG.md#600---2023-11-06) [Compare Source](https://togithub.com/alexrudall/ruby-openai/compare/v5.2.0...v6.0.0) ##### Added - \[BREAKING] HTTP errors will now be raised by ruby-openai as Faraday:Errors, including when streaming! Implemented by [@​atesgoral](https://togithub.com/atesgoral) - \[BREAKING] Switch from legacy Finetunes to the new Fine-tune-jobs endpoints. Implemented by [@​lancecarlson](https://togithub.com/lancecarlson) - \[BREAKING] Remove deprecated Completions endpoints - use Chat instead. ##### Fix - \[BREAKING] Fix issue where :stream parameters where replaced by a boolean in the client application. Thanks to [@​martinjaimem](https://togithub.com/martinjaimem), [@​vickymadrid03](https://togithub.com/vickymadrid03) and [@​nicastelo](https://togithub.com/nicastelo) for spotting and fixing this issue.

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Configuration

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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 8min)