[python-package] Remove dead Python 2 guard and sklearn.cross_validation fallback - #12163
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- Remove `assert sys.version_info[0] == 3` — XGBoost requires Python >= 3.10 (pyproject.toml), making this check dead code. Using `assert` for version checks is also incorrect as assertions are stripped under `python -O`. - Remove `sklearn.cross_validation` import fallback — `sklearn.cross_validation` was removed in scikit-learn 0.20 (2018). Any scikit-learn version supporting Python 3.10+ will have `sklearn.model_selection`.
This reverts commit bde4a3e.
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Closes #12086