Update file_io.py

[PythonFZ]

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[codecov]

Codecov Report

Merging #593 (52c26cf) into main (fa57efd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #593   +/-   ##
=======================================
  Coverage   89.16%   89.16%           
=======================================
  Files          20       20           
  Lines        1467     1467           
  Branches      570      570           
=======================================
  Hits         1308     1308           
  Misses        159      159           

Flag	Coverage Δ
fulltest	89.16% <100.00%> (ø)

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Impacted Files	Coverage Δ
zntrack/utils/file_io.py	74.24% <100.00%> (ø)

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