fix: Less intrusive forking warnings

[ritchie46]

closes #20000

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 79.50%. Comparing base (7c97625) to head (78785b8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
py-polars/polars/__init__.py	33.33%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20032   +/-   ##
=======================================
  Coverage   79.49%   79.50%           
=======================================
  Files        1556     1556           
  Lines      216527   216532    +5     
  Branches     2456     2458    +2     
=======================================
+ Hits       172136   172148   +12     
+ Misses      43833    43825    -8     
- Partials      558      559    +1     

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