env return exact type for specs

HelloWorldEnv.py

@@ -17,10 +17,10 @@ class HelloWorldEnv(PyEnvironment):
         self._client = airsim.MultirotorClient(ip=ip)
         super(HelloWorldEnv, self).__init__(handle_auto_reset)
 
-    def action_spec(self) -> NestedArraySpec:
+    def action_spec(self) -> BoundedArraySpec:
         return self._action_spec
     
-    def observation_spec(self) -> NestedArraySpec:
+    def observation_spec(self) -> ArraySpec:
         return self._observation_spec
     
     def _reset(self) -> TimeStep: