Fix backward compatibility test (#43371)
Summary:
Drop `.out` suffix from allow_list pattern added by https://github.com/pytorch/pytorch/issues/43272
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43371
Reviewed By: pbelevich
Differential Revision: D23256914
Pulled By: malfet
fbshipit-source-id: 10168b55b98c24c84ac2676963049d1eca5c182d
