Revert "Advance nightly docker to 11.6 (#86941)"
This reverts commit c5de535bc0b785abbacfebddf660af4cd3b2a6a1.
Reverted https://github.com/pytorch/pytorch/pull/86941 on behalf of https://github.com/atalman due to Workflow is passing but installs CUDA 11.3 PyTorch rather then 11.6
