Fix test on PyTorch < 1.12

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #5241 (664a499) into master (dc712a1) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

❗ Current head 664a499 differs from pull request most recent head 30b520d. Consider uploading reports for the commit 30b520d to get more accurate results

@@            Coverage Diff             @@
##           master    #5241      +/-   ##
==========================================
- Coverage   83.16%   83.05%   -0.11%     
==========================================
  Files         337      337              
  Lines       18569    18574       +5     
==========================================
- Hits        15443    15427      -16     
- Misses       3126     3147      +21     

Impacted Files	Coverage Δ
torch_geometric/utils/scatter.py	42.50% <100.00%> (-51.79%)	⬇️

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