fix: call tracker.close()

[JSabadin]

Call close() on Tracker After Training Completion

Summary

This update ensures close() is executed on the tracker after training finishes, aligning with recent changes in luxonis-ml (This PR)

[kozlov721]

LGTM, but we need to make a new release of luxonis-ml before we merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.79%. Comparing base (631b905) to head (78d2e81).
Report is 8 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
- Coverage   96.31%   95.79%   -0.53%     
==========================================
  Files         147      159      +12     
  Lines        6304     6902     +598     
==========================================
+ Hits         6072     6612     +540     
- Misses        232      290      +58     

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