Fix type annotation in tools/nightly.py (#64202)
Summary:
`tempfile.TemporaryDirectory` is a generic only in python-3.9 and above
Workaround by wrapping type annotation in quotes
Fixes https://github.com/pytorch/pytorch/issues/64017
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64202
Reviewed By: janeyx99
Differential Revision: D30644215
Pulled By: malfet
fbshipit-source-id: 3c16240b9fa899bd4d572c1732a7d87d3dd0fbd5
