NumPy 2.0 compatibility

[swryan]

This is more or less a heads-up about the upcoming NumPy 2.0 release: numpy/numpy#24300

A quick look test shows at least one incompatibility:

  File "/mdao/u/swryan/.conda/envs/openmdao_20231016-120012/lib/python3.11/site-packages/pyoptsparse/__init__.py", line 3, in <module>
    from .pyOpt_history import History
  File "/mdao/u/swryan/.conda/envs/openmdao_20231016-120012/lib/python3.11/site-packages/pyoptsparse/pyOpt_history.py", line 12, in <module>
    from .pyOpt_utils import EPS
  File "/mdao/u/swryan/.conda/envs/openmdao_20231016-120012/lib/python3.11/site-packages/pyoptsparse/pyOpt_utils.py", line 23, in <module>
    from .types import ArrayType
  File "/mdao/u/swryan/.conda/envs/openmdao_20231016-120012/lib/python3.11/site-packages/pyoptsparse/types.py", line 9, in <module>
    NumpyType = Union[float, npt.NDArray[np.float_]]
                                         ^^^^^^^^^
  File "/mdao/u/swryan/.conda/envs/openmdao_20231016-120012/lib/python3.11/site-packages/numpy/__init__.py", line 388, in __getattr__
    raise AttributeError(
AttributeError: `np.float_` was removed in the NumPy 2.0 release. Use `np.float64` instead.