[RLlib] fix VTrace in impala_tf_policy to support Keras 3 #45562
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Fix ValueError: Argument
learning_rate
should be float, or an instance of LearningRateSchedule, or a callable (that takes in the current iteration value and returns the corresponding learning rate value). Received instead: learning_rate=<tf.Variable 'lr:0' shape=() dtype=float32, numpy=0.0005>Fixes: #45050