Fix old python

Author: WillB97

simulator/modules/sbot_interface/devices/servo.py

@@ -4,6 +4,8 @@
 The servo will apply a small amount of variation to the power setting to simulate
 inaccuracies in the servo.
 """
+from __future__ import annotations
+
 from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING