Fix issues related to new behavior of JAX DeviceArray.copy()

In jax-ml/jax#10069, JAX changes the behavior of DeviceArray.copy() so that it returns a DeviceArray rather than returning a numpy array. For converting a DeviceArray to numpy, the preferred method is now np.asarray(device_array).

PiperOrigin-RevId: 438711926

trax/rl/task.py

@@ -271,6 +271,7 @@ def play(env, policy, dm_suite=False, max_steps=None, last_observation=None):
   cur_trajectory = Trajectory(last_observation)
   while not done and (max_steps is None or cur_step < max_steps):
     action, dist_inputs = policy(cur_trajectory)
+    action = np.asarray(action)
     step = env.step(action)
     if dm_suite:
       (observation, reward, done) = (