bugfix: change plots filename

[PythonFZ]

When multiple zn.plots where defined they would overwrite each other. Using different filenames prohibits this.

TODOs

• tests

[codecov]

Codecov Report

Merging #273 (09846d6) into main (d836039) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #273      +/-   ##
==========================================
+ Coverage   72.06%   72.23%   +0.17%     
==========================================
  Files          26       26              
  Lines        1149     1149              
  Branches      226      226              
==========================================
+ Hits          828      830       +2     
+ Misses        295      293       -2     
  Partials       26       26              

Flag	Coverage Δ
unittests	72.23% <100.00%> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
zntrack/zn/plots.py	68.00% <100.00%> (ø)
zntrack/utils/serializer.py	78.87% <0.00%> (+2.81%)	⬆️

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