1.4.0
MNT support cross 32bit/64bit pickles for HGBT (#28074)
FIX divide by zero in line search of GradientBoostingClassifier (#28095)
MNT add isort to ruff's rules (#26649)
MAINT remove deprecated base_estimator and base_estimator_ (#27826)
MAINT use Voting and Stacking support missing values (#27710)
FIX RandomForestRegressor OOB fails with integer-values multiple targets (#27817)
MAINT Fix ctypedef types in tree submodule (#27352)
FIX IsolationForest accepts sparse matrix with float value contamination (#27645)
MNT SLEP6: raise NotImplementedError for meta-estimators not supporting metadata routing (#27389)