[Transforms] Fix sparse-sparse matrix multiplication support on Windows

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #8197 (9be5659) into master (62599d1) will decrease coverage by 0.67%.
Report is 1 commits behind head on master.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #8197      +/-   ##
==========================================
- Coverage   88.06%   87.39%   -0.67%     
==========================================
  Files         473      473              
  Lines       28590    28595       +5     
==========================================
- Hits        25179    24992     -187     
- Misses       3411     3603     +192     

Files	Coverage Δ
torch_geometric/typing.py	51.72% <100.00%> (-30.26%)	⬇️
...ch_geometric/transforms/add_positional_encoding.py	92.30% <75.00%> (-1.25%)	⬇️
torch_geometric/transforms/two_hop.py	95.65% <83.33%> (-4.35%)	⬇️

... and 33 files with indirect coverage changes

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