[UserWarning] Fixing the warnings appearing in test_nn.py::test_group_rev_res.

[drivanov]

Description

The following warnings that appear in test_nn.py::test_group_rev_res have been fixed:

tests/python/pytorch/nn/test_nn.py::test_group_rev_res[idtype0]
/usr/local/lib/python3.10/dist-packages/dgl/nn/pytorch/conv/grouprevres.py:35: UserWarning: TypedStorage is deprecated. 
It will be removed in the future and UntypedStorage will be the only storage class. This should only matter to you 
if you are using storages directly.  To access UntypedStorage directly, use tensor.untyped_storage() instead 
of tensor.storage()

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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