Backport PR #24109 on branch v3.6.x (DOC: add API change note for colorbar deprecation) - #24112

Backport PR #24109 on branch v3.6.x (DOC: add API change note for colorbar deprecation)#24112

timhoffm merged 1 commit into

matplotlib:v3.6.xmatplotlib/matplotlib:v3.6.xfrom

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