Only use segment in case torch.use_deterministic_algorithms is set

[rusty1s]

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[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.24%. Comparing base (fefa636) to head (562738b).

Files	Patch %	Lines
torch_geometric/nn/aggr/base.py	88.88%	1 Missing ⚠️
torch_geometric/utils/_segment.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9009      +/-   ##
==========================================
- Coverage   89.86%   89.24%   -0.62%     
==========================================
  Files         468      468              
  Lines       30043    30043              
==========================================
- Hits        26998    26812     -186     
- Misses       3045     3231     +186     

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