Fix deprecated torch.cuda.amp.autocast usage in Nemotron model
Author: Ate329
Pull request: yes

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Updates the deprecated `torch.cuda.amp.autocast()` to use the recommended `torch.amp.autocast('cuda')` syntax in the Nemotron model implementation.

Fixes deprecation warning:
"`torch.cuda.amp.autocast(args...)` is deprecated. Please use `torch.amp.autocast('cuda', args...)` instead."

## Changes
- Replace `torch.cuda.amp.autocast()` with `torch.amp.autocast('cuda')` in `NemotronLayerNorm1P.forward()`


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Comments:
I have my doubts that this is BC, i.e. older versions will get import issues as amp doesn't have autocast then.

Edit: sorry, nvm upon reading docs it seems that it also works on older versions :D e.g. https://pytorch.org/docs/1.13/amp.html#torch.cuda.amp.autocast

Closing this PR as it appears to have been ignored, and the issue seems to have been resolved by other commits made after its creation.