contour.ClabelText and ContourLabeler.set_label_props

... are deprecated.

Use Text(..., transform_rotates_text=True) as a replacement for contour.ClabelText(...) and text.set(text=text, color=color, fontproperties=labeler.labelFontProps, clip_box=labeler.axes.bbox) as a replacement for the ContourLabeler.set_label_props(label, text, color).