tensorflow: fix tf.tile

[hoel-bagard]

The documentation says Tensor, but in practice this code works.

import tensorflow as tf

a = tf.constant([[1,2,3],[4,5,6]], tf.int32)
b = [1, 2]  # Tuple is also fine
tf.tile(a,b)

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉