Drop torch_sparse dependency in tests (10/n)

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #7061 (93101ed) into master (78dc031) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7061   +/-   ##
=======================================
  Coverage   91.43%   91.43%           
=======================================
  Files         436      436           
  Lines       23826    23828    +2     
=======================================
+ Hits        21786    21788    +2     
  Misses       2040     2040           

Impacted Files	Coverage Δ
torch_geometric/typing.py	100.00% <ø> (ø)
torch_geometric/nn/conv/message_passing.py	97.34% <100.00%> (+<0.01%)	⬆️
torch_geometric/nn/conv/utils/typing.py	83.95% <100.00%> (+0.20%)	⬆️

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