Fix pyomo import with NumPy v2.0 or greater

[jtkmckenna]

Fixes #3290

import pyomo with NumPy 2.0

Summary/Motivation:

NumPy 2.0 has removed np.float_ and np.complex_

Error demonstration (with NumPy 2.0):

import numpy as np
import pyomo
AttributeError: `np.float_` was removed in the NumPy 2.0 release. Use `np.float64` instead.. Did you mean: 'float16'?

Changes proposed in this PR:

Here I set a version check before including them

Per the release notes: https://numpy.org/devdocs/release/2.0.0-notes.html

• Alias np.float_ has been removed. Use np.float64 instead.
• Alias np.complex_ has been removed. Use np.complex128 instead.

Now

import numpy as np
import pyomo

Does not raise any errors

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[mrmundt]

Thanks, @jtkmckenna , but I actually already have a branch for this - it has some extra fixes / test changes. I've just been waiting for NumPy 2 to fully release.