Use GPU for audio encoder on macOS 13

[ZachNagengast]

Some of the audio encoder models have unexpected outputs using the neural engine on macOS 13, this will set the default to GPU. It can still be overridden by passing in your own ModelComputeOptions object into the computeOptions property of the WhisperKit() init method.

Example with jfk.wav, with fix:

And so my fellow Americans, ask not what your country can do for you, ask what you can do for your country.

Without fix:

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