Fix return value type

Author: OhmV-IR

commands2/commandscheduler.py

@@ -334,7 +334,7 @@ def unregisterSubsystem(self, *subsystems: Subsystem) -> None:
         for subsystem in subsystems:
             self._subsystems.pop(subsystem, None)
 
-    def getAllSubsystems(self) -> tuple[Subsystem]:
+    def getAllSubsystems(self) -> tuple[Subsystem, ...]:
         """
         Gets all registered subsystems as an immutable tuple.
         """