Ensure sample format code value gets extracted from Numpy struct

[tasansal]

Python 3.13.0 has a bug where it can't compare singleton numpy arrays in Enum construction. It was fixed in 3.13.1; however, we should still support 3.13.0.

In this fix we ensure the singleton item is extracted with .item() method, consistent with other value extractions in the same function.

This was noticed due to documentation build errors on readthedocs with 3.13.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.66%. Comparing base (511b652) to head (962f86f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
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  Coverage   95.66%   95.66%           
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  Files          49       49           
  Lines        2397     2397           
  Branches      128      128           
=======================================
  Hits         2293     2293           
  Misses         80       80           
  Partials       24       24           

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