1.9.0
DOC Fixing typos (#30640)
DOC Add a callback glossary section (#34066)
MNT Fix typos found by typos (#33916)
DOC: Correct many a/an usage mistakes (#32996)
DOC data interoperability and pandas/polars output for transformers (#33788)
ENH add narwhals as dependency (#31127)
FEA Callbacks API (#33322)
DOC Recommend cleaning the doc repo only for major final releases (#34050)
DOC: Correct a few typos in scikit-learn documentation (#33657)
DOC rename tag to `setup_development_environment` (#32623)
DOC Switch insecure http links to https (#32969)
DOC add section on `matplotlib` usage within the display classes (#34136)
DOC: Correct many grammatical issues (#32820)