fix type hints

[PythonFZ]

No description provided.

[codecov]

Codecov Report

Merging #260 (a2699ba) into main (3e77134) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage   71.81%   71.81%           
=======================================
  Files          26       26           
  Lines        1100     1100           
  Branches      211      211           
=======================================
  Hits          790      790           
  Misses        286      286           
  Partials       24       24           

Flag	Coverage Δ
unittests	71.81% <100.00%> (ø)

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Impacted Files	Coverage Δ
zntrack/zn/dependencies.py	88.23% <100.00%> (ø)

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