Stop using numpy type aliases that were deprecated in 1.20 and later removed

[musicinmybrain]

The types np.object and np.int were just aliases for the built-in object and int, respectively, so use those instead.

In older numpy releases, numpy.bool was the same as Python bool. This was deprecated in 1.20 and later removed for 1.x, then the name numpy.bool was reintroduced in numpy 2.x as an alias for numpy.bool_, a Boolean value stored as a byte. By using numpy.bool_ everywhere, we get the same data type on all Python versions.

Fixes:

E           AttributeError: module 'numpy' has no attribute 'object'.
E           `np.object` was a deprecated alias for the builtin `object`. To avoid this error in existing code, use `object` by itself. Doing this will not modify any behavior and is safe.
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

E           AttributeError: module 'numpy' has no attribute 'int'.
E           `np.int` was a deprecated alias for the builtin `int`. To avoid this error in existing code, use `int` by itself. Doing this will not modify any behavior and is safe. When replacing `np.int`, you may wish to use e.g. `np.int64` or `np.int32` to specify the precision. If you wish to review your current use, check the release note link for additional information.
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

(Only on numpy 1.x; numpy.bool works on 2.x, but with a different meaning):

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_'?