Unpin torch versions in CI

[DN6]

What does this PR do?

Transformers and Accelerate have unpinned torch versions in their CI. I think it's safe for us to do so as well now. Our CI will now use torch 2.2

Fixes # (issue)

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[sayakpaul]

Thanks! Do the xFormers tests pass as well?

[DN6]

Yup. Xformers should pass as well.