Use trial multiprocess feature even when collecting coverage

Created by: codecov[bot]

Codecov Report

Merging #306 (bf44f510) into main (be012031) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
- Coverage   91.62%   91.60%   -0.02%     
==========================================
  Files          55       55              
  Lines        5101     5101              
  Branches      698      698              
==========================================
- Hits         4674     4673       -1     
- Misses        372      373       +1     
  Partials       55       55              

Impacted Files	Coverage Δ
src/_zkapauthorizer/tests/test_model.py	93.40% <0.00%> (-0.37%)

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