Use XGBoost version 3.0

[mayer79]

Adapt README for XGBoost 3

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.57%. Comparing base (3c37e6f) to head (c056904).
⚠️ Report is 51 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   96.56%   95.57%   -0.99%     
==========================================
  Files          18       18              
  Lines        1047     1107      +60     
==========================================
+ Hits         1011     1058      +47     
- Misses         36       49      +13     

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