Add xgboost dependency and update lock file with new package details

- Added xgboost version 3.1.2 to pyproject.toml dependencies.
- Updated uv.lock to include xgboost package with its dependencies and wheel URLs.
- Added nvidia-nccl-cu12 package to uv.lock for compatibility with xgboost on specific platforms.

pyproject.toml

@@ -21,6 +21,7 @@ dependencies = [
     "seaborn>=0.13.2",
     "shap>=0.49.1",
     "tensorflow>=2.20.0",
+    "xgboost>=3.1.2",
     "yfinance>=0.2.66",
 ]