Pin nightly builds to last commit before 5am UTC (#17381)
Summary:
This fell through the cracks from the migration from pytorch/builder to circleci. It's technically still racey, but is much less likely now
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17381
Differential Revision: D14190137
Pulled By: pjh5
fbshipit-source-id: 2d4cd04ee874cacce47d1d50b87a054b0503bb82
