ENH: providing lambda to sort() is no longer needed

rocketpy/simulation/flight.py

@@ -3626,7 +3626,7 @@ def add_controllers(self, controllers, t_init, t_end):
                 self.list += controller_node_list
 
         def sort(self):
-            self.list.sort(key=(lambda node: node.t))
+            self.list.sort()
 
         def merge(self):
             """Merge all the time nodes that have the same time. This is made to