[Fix Test] Fix failed generation test by pining pytorch nightlies

[acisseJZhong]

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Some of the generation tests are failing with latest pytorch nightlies. See link. We(thanks to @ebsmothers ) triaged the issue down to pytorch nightlies 2/2. To fix CI for now, we pinged pytorch nightlies to the 2/1 version.

Need to look into what exactly in 2/2 causes the failure.

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[ebsmothers]

I think ao and torchvision versions are not right here

[acisseJZhong]

oops got it!

[ebsmothers]

Thanks for doing this! The one tricky thing is testing.. we want to make sure that this will unbreak our CI, but the CI against PyTorch nightlies doesn't run until push. So can you do the following?

1. Comment out L33-34 of gpu_test.yaml, push changes, let CI run
2. Confirm that CI is green, then revert to the original version (i.e. uncomment L33-34). Then we can push

(1) will allow the CI to also run on nightlies on this PR so we can get signal before landing

[ebsmothers]

Thank you for the fix! Looking forward to having green CI again