Update .gitignore to ignore NFS handle files (#54618)
Summary:
Ignore NFS handle files starting with .nfs*.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54618
Reviewed By: malfet
Differential Revision: D27304405
Pulled By: heitorschueroff
fbshipit-source-id: 9abeed796fec0a4ff416eacea450f3f8e2813b32
