Refactor ProcessPoolExecutor.

[tobiasraabe]

• Fix.
• to changes.

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in CHANGES.md.

[codecov]

Codecov Report

Merging #56 (e830e4f) into main (49d48ac) will decrease coverage by 0.66%.
The diff coverage is 72.72%.

❗ Current head e830e4f differs from pull request most recent head 4cefdfc. Consider uploading reports for the commit 4cefdfc to get more accurate results

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   95.09%   94.44%   -0.66%     
==========================================
  Files          10       10              
  Lines         408      414       +6     
==========================================
+ Hits          388      391       +3     
- Misses         20       23       +3     

Flag	Coverage Δ
end_to_end	87.68% <72.72%> (-0.56%)	⬇️
integration	50.00% <72.72%> (+0.49%)	⬆️
unit	46.37% <63.63%> (+0.78%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pytask_parallel/execute.py	92.59% <ø> (-0.23%)	⬇️
src/pytask_parallel/backends.py	70.00% <72.72%> (+1.57%)	⬆️

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