audio

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Motivation: we're using a custom pytorch build and have patch release more recently than upstream. While those updates do not change any abi, we want to allow torchaudio/torchvision (https://github.com/pytorch/vision/pull/8936) to tolerance the changed pytorch version when we update pytorch, otherwise pip will raise a warning.

In this PR, we add two new envionment variable to generate a version range for pytorch.