Install CUDA manually on Windows CI to avoid flakiness (#34940)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/34821.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34940
Differential Revision: D20538056
Pulled By: ezyang
fbshipit-source-id: af1b2e9f9a80796763025d01eade3ab31b9d0cdb
