Upgrade to FFmpeg5

[mthrok]

This commit upgrade the version of FFmpeg compiled against TorchAudio binary distribution to 5.0.4.

FFmpeg 5.0 was released in Jan 2022, and many package managers provide a version of FFmpeg v5.
Conda-forge lists 5.1 for all the platforms TorchAudio supports.https://anaconda.org/conda-forge/ffmpeg

[pytorch-bot]

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• build (3.8) (gh)

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@mthrok merged this pull request in d38a785.

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Hey @mthrok.
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