use as_posix instead of str()

[PythonFZ]

No description provided.

[codecov]

Codecov Report

Merging #241 (dd93c33) into main (86fc2f4) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   69.44%   69.44%           
=======================================
  Files          23       23           
  Lines         985      985           
  Branches      183      183           
=======================================
  Hits          684      684           
  Misses        284      284           
  Partials       17       17           

Flag	Coverage Δ
unittests	69.44% <0.00%> (ø)

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Impacted Files	Coverage Δ
zntrack/core/functions/decorator.py	31.70% <0.00%> (ø)

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