Fixes HFTracer getattr for PyTorch 1.13+
# What does this PR do?

There was an API change where `torch.fx.Tracer._module_getattr` became `torch.fx.Tracer.getattr`, causing issues when using the `HFTracer` with `torch-nightly`. This PR fixes that.

Fixes: https://github.com/pytorch/pytorch/issues/84840 (@pbelevich)
_The documentation is not available anymore as the PR was closed or merged._<|||||>cc @Chillee