Restrict HeteroData edge type indexing

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4782 (d2d40fb) into master (df61109) will decrease coverage by 1.89%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4782      +/-   ##
==========================================
- Coverage   84.43%   82.53%   -1.90%     
==========================================
  Files         325      325              
  Lines       17372    17370       -2     
==========================================
- Hits        14668    14337     -331     
- Misses       2704     3033     +329     

Impacted Files	Coverage Δ
torch_geometric/data/hetero_data.py	94.40% <100.00%> (+0.01%)	⬆️
torch_geometric/nn/models/dimenet_utils.py	0.00% <0.00%> (-75.52%)	⬇️
torch_geometric/nn/models/dimenet.py	14.51% <0.00%> (-53.00%)	⬇️
torch_geometric/nn/conv/utils/typing.py	81.25% <0.00%> (-17.50%)	⬇️
torch_geometric/nn/inits.py	67.85% <0.00%> (-7.15%)	⬇️
torch_geometric/nn/resolver.py	90.00% <0.00%> (-6.67%)	⬇️
torch_geometric/io/tu.py	93.90% <0.00%> (-2.44%)	⬇️
torch_geometric/nn/models/mlp.py	98.52% <0.00%> (-1.48%)	⬇️
torch_geometric/transforms/gdc.py	78.17% <0.00%> (-1.02%)	⬇️
torch_geometric/data/dataset.py	96.80% <0.00%> (-0.80%)	⬇️
... and 3 more

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