Add CUDA 11 builds for Windows CI (#42420)
Summary:
Stacked on https://github.com/pytorch/pytorch/pull/42410.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42420
Reviewed By: seemethere
Differential Revision: D22917230
Pulled By: malfet
fbshipit-source-id: 6ad394f7f8c430c587e0b0d9c5a5e7b7bcd85bfe
