Fix numpy upgrade to 2.0.0 BUFSIZE import error (#5680)
Numpy 2.0.0 removed the BUFSIZE API, replacing it with
'numpy._core.umath.BUFSIZE'.
The minimum numpy version supported by the new code is 1.26.1. If you
need to support the lower numpy version, please tell me and we can add
another path.
Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>
