Do not autoremove prototype in release branch

[mthrok]

So that release engineering team does not have to manually remove prototype-related things in each release

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3663

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As of commit 894a584d1a99356652c4051d98c1815cf0d94d62 with merge base 671261c39c04a1999c75f9a9a04ffa8ebf1d095d (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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