Update CUDA11 docker container (#42200)
Summary:
- no more `-rc`
- add magma
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42200
Reviewed By: ZolotukhinM, mruberry
Differential Revision: D23411686
Pulled By: malfet
fbshipit-source-id: 04532bc1cc65b3e14ddf29e8bf61a7a3b4c706ad
