Be more specific in return hint

Signed-off-by: liamhuber <[email protected]>

pyiron_workflow/nodes/composite.py

@@ -277,7 +277,7 @@ def _get_state_from_remote_other(self, other_self):
         state.pop("_parent")  # Got overridden to None for __getstate__, so keep local
         return state
 
-    def disconnect_run(self) -> list[tuple[Channel, Channel]]:
+    def disconnect_run(self) -> list[tuple[InputSignal, OutputSignal]]:
         """
         Disconnect all `signals.input.run` connections on all child nodes.