fix: Correct pawn promotion logic and update Go module dependencies

[CorentinGS]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.04%. Comparing base (15cc544) to head (db0c76e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   69.57%   70.04%   +0.46%     
==========================================
  Files          27       27              
  Lines        4904     4904              
==========================================
+ Hits         3412     3435      +23     
+ Misses       1369     1344      -25     
- Partials      123      125       +2     

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