chore(deps): update dependency openai to v1.38.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
openai	==1.37.2 -> ==1.38.0

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Release Notes

openai/openai-python (openai)

### [`v1.38.0`](https://togithub.com/openai/openai-python/blob/HEAD/CHANGELOG.md#1380-2024-08-02) [Compare Source](https://togithub.com/openai/openai-python/compare/v1.37.2...v1.38.0) Full Changelog: [v1.37.2...v1.38.0](https://togithub.com/openai/openai-python/compare/v1.37.2...v1.38.0) ##### Features - extract out `ImageModel`, `AudioModel`, `SpeechModel` ([#​1586](https://togithub.com/openai/openai-python/issues/1586)) ([b800316](https://togithub.com/openai/openai-python/commit/b800316aee6c8b2aeb609ca4c41972adccd2fa7a)) - make enums not nominal ([#​1588](https://togithub.com/openai/openai-python/issues/1588)) ([ab4519b](https://togithub.com/openai/openai-python/commit/ab4519bc45f5512c8c5165641c217385d999809c))

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