Provide strtobool to avoid use of deprecated (removed in 3.12) distutils

[yarikoptic]

Motivation

Makes incompatible with 3.12

TODO

• add testing for 3.12

[yarikoptic]

• please advise on how to update CHANGELOG or feel welcome to update on my behalf
• quick review/merge/release would be appreciated since needed to bring dandi-cli into green on CI again.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.85%. Comparing base (2e42e34) to head (67625df).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #457      +/-   ##
==========================================
+ Coverage   86.78%   86.85%   +0.07%     
==========================================
  Files          23       23              
  Lines        1241     1248       +7     
==========================================
+ Hits         1077     1084       +7     
  Misses        164      164              

Flag	Coverage Δ
unittests	86.85% <100.00%> (+0.07%)	⬆️

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Files	Coverage Δ
src/nwbinspector/nwbinspector.py	84.71% <ø> (-0.07%)	⬇️
src/nwbinspector/testing.py	83.63% <100.00%> (-0.30%)	⬇️
src/nwbinspector/utils.py	88.33% <100.00%> (+0.94%)	⬆️