One more rename

ml-agents/mlagents/trainers/tests/dummy_config.py

 from typing import List, Tuple
-from mlagents_envs.base_env import ObservationSpec, DimensionProperty, SensorType
+from mlagents_envs.base_env import ObservationSpec, DimensionProperty, ObservationType
 import pytest
 import copy
 import os
     obs_specs: List[ObservationSpec] = []
     for shape in shapes:
         dim_prop = (DimensionProperty.UNSPECIFIED,) * len(shape)
-        spec = ObservationSpec(shape, dim_prop, SensorType.OBSERVATION)
+        spec = ObservationSpec(shape, dim_prop, ObservationType.DEFAULT)
         obs_specs.append(spec)
     return obs_specs