1.2.1
Imp splitting of test_preprocessing.py
DOC Switch to gender neutral terms for sister function (#23003)
DOC Fix some typos (#24300)
API Rename OneHotEncoder option sparse to sparse_output (#24412)
FIX Ensure dtype of categories is `object` for strings in `OneHotEncoder` (#25174)
FIX Handles all numerical DataFrames with check_inverse=True in FunctionTransformer (#25274)
FIX Improves nan support in LabelEncoder (#22629)
FIX SplineTransformer.get_feature_names_out returns correct names for extrapolations=periodic (#25296)