Docs push fix .netrc sometimes a directory (#91745)
Sometimes .netrc is a directory even though it's in the temp folder.
AFAIK there's nothing in the folder https://github.com/pytorch/pytorch/actions/runs/3842987245/jobs/6544919416
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91745
Approved by: https://github.com/huydhn, https://github.com/ZainRizvi
