client: destroy created context in stop_channels

improves cleanup

Author: minrk

jupyter_client/client.py

@@ -334,6 +334,9 @@ def stop_channels(self) -> None:
         if self.control_channel.is_alive():
             self.control_channel.stop()
 
+        if self._created_context and not self.context.closed:
+            self.context.destroy()
+
     @property
     def channels_running(self) -> bool:
         """Are any of the channels created and running?"""