Unpin PyTorch to test if doc builds
# What does this PR do?

The doc building seg-faults since we pinned PyTorch. Using this PR to experiment.
_The documentation is not available anymore as the PR was closed or merged._<|||||>The tests fail from the beginning with `Fatal Python error: Segmentation fault`, and no failed tests being collected/reported.
**We still need to pin torch.** 

Doc build jobs pass now after the docker image being re-built last night (my best guess for the reason)
