Update dependency ruby-openai to v6.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ruby-openai (changelog)	'6.4.0' -> '6.5.0'

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Release Notes

alexrudall/ruby-openai (ruby-openai)

### [`v6.5.0`](https://togithub.com/alexrudall/ruby-openai/blob/HEAD/CHANGELOG.md#650---2024-03-31) [Compare Source](https://togithub.com/alexrudall/ruby-openai/compare/v6.4.0...v6.5.0) ##### Added - Add back the deprecated Completions endpoint that I removed a bit prematurely. Thanks, \[[@​mishranant](https://togithub.com/mishranant)]\(https://github.com/ mishranant) and everyone who requested this.

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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 10min)