Fix tf.keras.dataset.mnist/reuters np v1.16.3
Fix tf.keras.dataset.mnist/reuters np v1.16.3

This fix add `allow_pickle=True` to fix the numpy issue in 1.16.3.

See https://github.com/keras-team/keras/commit/34231971fa47cb2477b357c1a368978de4128294
and https://github.com/keras-team/keras/pull/12714

for related changes in keras-team/keras.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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