Update async-openai to 0.28.0

[skabber]

Description of change

Update async-openai to 0.28.0
The async-openai upstream version has more Voices available in the text to speech api.
https://platform.openai.com/docs/guides/text-to-speech

How has this been tested? (if applicable)

Locally on my branch.

[greptile-apps]

PR Summary

Updates the async-openai dependency from 0.23.0 to 0.28.0 to access expanded text-to-speech voice options in the OpenAI API integration.

• Significant version jump in resources/openai/Cargo.toml from 0.23.0 to 0.28.0 may require testing for breaking changes
• Update enables access to new voice options in OpenAI's text-to-speech API
• Consider adding integration tests specifically for text-to-speech functionality to verify compatibility

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[greptile-apps]

PR Summary

(updates since last review)

The removal of the examples directory and its submodule configuration represents a significant structural change to the repository.

• Removed examples directory and its submodule configuration in .gitmodules that previously linked to ../shuttle-examples.git
• This change impacts developers who rely on in-repo examples for reference and testing
• Consider documenting alternative ways to access examples, such as pointing to the separate examples repository

The changes appear unrelated to the async-openai update and may need separate justification or rollback consideration.

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[greptile-apps]

PR Summary

(updates since last review)

Re-added the examples directory as a Git submodule, restoring the reference implementation access for developers.

• Added back .gitmodules file with path to ../shuttle-examples.git
• Developers should run git submodule init and git submodule update after pulling these changes
• Consider adding these submodule initialization steps to the CI pipeline

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[greptile-apps]

PR Summary

(updates since last review)

No significant changes found since the last review. The core change remains updating async-openai to version 0.28.0 in resources/openai/Cargo.toml to support expanded text-to-speech voice options.

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[oddgrd]

Thanks, @skabber! Did you try running our openai example (or something equivalent) and see that there were no breaking changes, by the way?

[skabber]

I did run the openai-example locally and it still works.

[oddgrd]

Awesome, thanks!