Drop torch_sparse dependency in tests (1/n)

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #7041 (1a7096d) into master (c78c5b2) will decrease coverage by 0.29%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##           master    #7041      +/-   ##
==========================================
- Coverage   91.79%   91.51%   -0.29%     
==========================================
  Files         435      435              
  Lines       23780    23780              
==========================================
- Hits        21830    21762      -68     
- Misses       1950     2018      +68     

Impacted Files	Coverage Δ
torch_geometric/transforms/feature_propagation.py	94.59% <83.33%> (-2.55%)	⬇️
...ch_geometric/transforms/add_positional_encoding.py	98.24% <100.00%> (-0.04%)	⬇️
torch_geometric/transforms/rooted_subgraph.py	100.00% <100.00%> (ø)
torch_geometric/transforms/sign.py	100.00% <100.00%> (ø)
torch_geometric/transforms/two_hop.py	100.00% <100.00%> (ø)

... and 16 files with indirect coverage changes

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