Do not call shutdown() in run_parallel() when jobs=1

[GianlucaFicarelli]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.09%. Comparing base (0feee35) to head (8573ef5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   88.83%   89.09%   +0.25%     
==========================================
  Files           6        6              
  Lines         385      385              
  Branches       88       88              
==========================================
+ Hits          342      343       +1     
  Misses         24       24              
+ Partials       19       18       -1     

Flag	Coverage Δ
pytest	89.09% <100.00%> (+0.25%)	⬆️

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