Use bool instead of np.bool alias in generic kubeflow pipeline example

[lugi0]

What changes were proposed in this pull request?

The np.bool alias was deprecated in Numpy 1.20 (https://numpy.org/doc/1.20/release/1.20.0-notes.html?highlight=numpy%20bool#using-the-aliases-of-builtin-types-like-np-int-is-deprecated) and completely breaks in Numpy 1.24. Using bool is equivalent to using np.bool.

How was this pull request tested?

Ran as a kubeflow pipeline, both before the change (failing) and after (passing).

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