CI: run tests in parallel

[theroggy]

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[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 93.24%. Comparing base (5f08842) to head (02674de).
Report is 19 commits behind head on main.

Files	Patch %	Lines
geofileops/util/_io_util.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
+ Coverage   93.11%   93.24%   +0.12%     
==========================================
  Files          21       21              
  Lines        4113     4189      +76     
==========================================
+ Hits         3830     3906      +76     
  Misses        283      283              

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