Implement a none backend as default.

[tobiasraabe]

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[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 52.06%. Comparing base (821ee83) to head (87917a2).

❗ Current head 87917a2 differs from pull request most recent head b8a8a97. Consider uploading reports for the commit b8a8a97 to get more accurate results

Files	Patch %	Lines
src/pytask_parallel/config.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   52.14%   52.06%   -0.09%     
==========================================
  Files          17       17              
  Lines         652      655       +3     
==========================================
+ Hits          340      341       +1     
- Misses        312      314       +2     

Flag	Coverage Δ
unit	52.06% <20.00%> (-0.09%)	⬇️

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