Give Python sub-version in GHA CUDA workflow name (#57770)
Summary:
Addresses part of https://github.com/pytorch/pytorch/issues/57686#issuecomment-833672132. Evidence that the Python version is indeed 3.6: https://github.com/pytorch/pytorch/runs/2520276328
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57770
Test Plan: CI would be nice, but this workflow does not currently run on PRs.
Reviewed By: malfet
Differential Revision: D28265048
Pulled By: samestep
fbshipit-source-id: 513caf52a8f18d6e529e0934bf024f49e1571926
