Backport PR matplotlib#28625: added typing_extensions.Self to _AxesBase.twinx

Author: ksunden

lib/matplotlib/axes/_base.pyi

@@ -4,6 +4,7 @@ import datetime
 from collections.abc import Callable, Iterable, Iterator, Sequence
 from matplotlib import cbook
 from matplotlib.artist import Artist
+from matplotlib.axes import Axes
 from matplotlib.axis import XAxis, YAxis, Tick
 from matplotlib.backend_bases import RendererBase, MouseButton, MouseEvent
 from matplotlib.cbook import CallbackRegistry
@@ -384,8 +385,8 @@ class _AxesBase(martist.Artist):
         bbox_extra_artists: Sequence[Artist] | None = ...,
         for_layout_only: bool = ...
     ) -> Bbox | None: ...
-    def twinx(self) -> _AxesBase: ...
-    def twiny(self) -> _AxesBase: ...
+    def twinx(self) -> Axes: ...
+    def twiny(self) -> Axes: ...
     def get_shared_x_axes(self) -> cbook.GrouperView: ...
     def get_shared_y_axes(self) -> cbook.GrouperView: ...
     def label_outer(self, remove_inner_ticks: bool = ...) -> None: ...