Fix audio entitlements for MacOS and file validation in resolveDownload #131

Job	Run time
tests (Codecs, MLXAudioTests/MLXAudioCodecsTests)	8m 32s
tests (STT, MLXAudioTests/MLXAudioSTTTests)	13m 5s
tests (TTS, MLXAudioTests/MLXAudioTTSTests)	5m 41s
tests (VAD, MLXAudioTests/MLXAudioVADTests)	11m 43s
	39m 1s

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