Return type hint in EnergyConsumptionModel.motive_energy_per_km breaks python < 3.9 about carculator HOT 2 CLOSED

diff --git a/carculator/energy_consumption.py b/carculator/energy_consumption.py
index b121caa..dfbc23e 100644
--- a/carculator/energy_consumption.py
+++ b/carculator/energy_consumption.py
@@ -4,7 +4,7 @@ one for calculating the auxiliary energy needs, and another one for calculating
 energy needs.
 """
 
-from typing import Any, Union
+from typing import Any, Union, Tuple
 
 import numexpr as ne
 import numpy as np
@@ -132,7 +132,7 @@ class EnergyConsumptionModel:
         frontal_area: Union[float, np.ndarray, xr.DataArray],
         sizes: Union[str, np.ndarray, xr.DataArray],
         motor_power: Union[float, np.ndarray, xr.DataArray] = 0,
-    ) -> tuple[Union[float, Any], Any, Union[float, Any]]:
+    ) -> Tuple[Union[float, Any], Any, Union[float, Any]]:
         """
         Calculate energy used and recuperated for a given vehicle per km driven.