Remove GeoAxes patch at next Cartopy release

[trexfeathers]

📰 Custom Issue

SciTools/cartopy#2390

iris/lib/iris/plot.py

Lines 46 to 60 in 57096f2

	class _GeoAxesPatched(cartopy.mpl.geoaxes.GeoAxes):
	# TODO: see cartopy#2390
	# Remove this once the bug is addressed in a Cartopy release.
	def _draw_preprocess(self, renderer):
	super()._draw_preprocess(renderer)
	for artist in self.artists:
	if hasattr(artist, "_draw_gridliner"):
	# Note this is only necessary since Cartopy v0.23, but is not
	# wasteful for earlier versions as _draw_gridliner() includes
	# a check for whether a draw is necessary.
	artist._draw_gridliner(renderer=renderer)
	cartopy.mpl.geoaxes.GeoAxes = _GeoAxesPatched