ci: add repo-token for stale workflow
This should put us up to 5000 API actions per hour
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Fixes #ISSUE_NUMBER
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75533
Approved by: https://github.com/suo, https://github.com/malfet
