[FutureWarning] Resolving warnings caused by deprecated function usage.

[drivanov]

Description

This PR provides a fix for the following warnings:

/usr/local/lib/python3.10/dist-packages/dgl/backend/pytorch/sparse.py:148: FutureWarning: `torch.cuda.amp.autocast(args...)` 
is deprecated. Please use `torch.amp.autocast('cuda', args...)` instead.
  return th.cuda.amp.autocast(enabled=False)

/usr/local/lib/python3.10/dist-packages/dgl/backend/pytorch/sparse.py:157: FutureWarning: `torch.cuda.amp.autocast_mode._cast(value, dtype)` 
is deprecated. Please use `torch.amp.autocast_mode._cast(value, 'cuda', dtype)` instead.
  return th.cuda.amp.autocast_mode._cast(

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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[jermainewang]

Which PyTorch version is this future warning introduced?

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[drivanov]

As far as I can tell, this change was introduced on June 2, 2024:

andreii@andrei-Ubuntu:~/Projects/pytorch$ git blame -L 56,60 torch/cuda/amp/autocast_mode.py 
67ef2683d97 (Xuehai Pan 2024-06-02 07:31:08 +0000 56) @deprecated(
67ef2683d97 (Xuehai Pan 2024-06-02 07:31:08 +0000 57)     "`torch.cuda.amp.autocast_mode._cast(value, dtype)` is deprecated. "
67ef2683d97 (Xuehai Pan 2024-06-02 07:31:08 +0000 58)     "Please use `torch.amp.autocast_mode._cast(value, 'cuda', dtype)` instead.",
67ef2683d97 (Xuehai Pan 2024-06-02 07:31:08 +0000 59)     category=FutureWarning,
67ef2683d97 (Xuehai Pan 2024-06-02 07:31:08 +0000 60) )

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