Remove get_renderer_cache

Author: oscargus

lib/matplotlib/axes/_base.py

@@ -3078,10 +3078,6 @@ def redraw_in_frame(self):
                 stack.enter_context(artist._cm_set(visible=False))
             self.draw(self.figure.canvas.get_renderer())
 
-    @_api.deprecated("3.6", alternative="Axes.figure.canvas.get_renderer()")
-    def get_renderer_cache(self):
-        return self.figure.canvas.get_renderer()
-
     # Axes rectangle characteristics
 
     def get_frame_on(self):