1.9.0
MNT Fix pre-commit issues (#31013)
DOC: Fix typos in the scikit-learn Examples (#32241)
CLN replace authors with the standard line (#29250)
MNT Add author/license note where missing and add the linter (#29477)
DOC: Remove 'print(__doc__)' in scikit-learn examples (#32529)
DOC: Clarify the sign in log marginal likelihood plot. (#30273)
FIX ConvergenceWarning in plot_gpr_on_structured_data (#31164) (#31289)
DOC Correct many typos in code comments (#32666)