Remove self._renderer from AnnotationBbox and ConnectionPatch

As far as I can tell, these are unused, and cause problems for pickling

Closes matplotlib#27805

Author: ksunden

lib/matplotlib/offsetbox.py

@@ -1407,8 +1407,6 @@ def update_positions(self, renderer):
 
     def draw(self, renderer):
         # docstring inherited
-        if renderer is not None:
-            self._renderer = renderer
         if not self.get_visible() or not self._check_xy(renderer):
             return
         renderer.open_group(self.__class__.__name__, gid=self.get_gid())

lib/matplotlib/patches.py

@@ -4696,8 +4696,6 @@ def _check_xy(self, renderer):
         return True
 
     def draw(self, renderer):
-        if renderer is not None:
-            self._renderer = renderer
         if not self.get_visible() or not self._check_xy(renderer):
             return
         super().draw(renderer)