Bug fix write_validity

[theHenks]

Fixed import of Distributed for validity creation.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 41.96%. Comparing base (c835c1f) to head (39b6714).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils/pars_utils.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   41.96%   41.96%           
=======================================
  Files          26       26           
  Lines        1959     1959           
=======================================
  Hits          822      822           
  Misses       1137     1137           

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