Add lint to ensure .github/ pypi dependencies are pinned (#64463)
Summary:
Example failing run: https://github.com/pytorch/pytorch/pull/64463/checks?check_run_id=3501249102
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64463
Reviewed By: janeyx99
Differential Revision: D30744930
Pulled By: driazati
fbshipit-source-id: 4dd97054db1d4c776a4512bc3d664987cd7b6d23
