Remove usage of deprecated np.bool and np.long

[oliverholworthy]

Replace deprecated np.bool with bool in FillMisisng operator

Fixes the following error that shows up in test_fill.py with newer numpy versions

E           AttributeError: module 'numpy' has no attribute 'bool'.
E           `np.bool` was a deprecated alias for the builtin `bool`. To avoid this error in existing code, use `bool` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.bool_` here.
E           The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
E               https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations. Did you mean: 'bool_'?

[github-actions]

Documentation preview

https://nvidia-merlin.github.io/NVTabular/review/pr-1851