feat: use `htdemucs` model for stem separation instead of `htdemucs_ft`

Fix: use librosa.load instead of torchaudio.load (torchcodec can't open MP3)

Fix: remove invalid condition_on_previous_text kwarg; fix torch_dtype deprecation

Add torchcodec to fix torchaudio.load backend

Fix: defer CUDA usage to inside @spaces.GPU; use soundfile backend for torchaudio.load

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