fix: (outetts)loading model: Speaker file not found.

[zysam]

Error loading model: Speaker file not found: mlx-audio/lib/python3.12/site-packages/mlx_audio/tts/models/outetts/default_speaker.json

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Checklist

• [ ] Tests added/updated
• [ ] Documentation updated
• [ ] Issue referenced (e.g., Closes #123)

[Blaizzy]

Thanks @zysam!

We will merge as soon as the tests clear