Updates for np 2 and more

[chrishavlin]

Replaces #122

• Removes PyOpenGL-accelerate from test deps (not compatible with np 2 and I don't think we really need it) -- full stack trace is in this comment.
• add a new test run with np < 2
• update the build-system to use np 2, newer cython
• update package metadata for compatible python versions

[chrishavlin]

adding a note for myself on removing the oldest-supported numpy... from https://github.com/scipy/oldest-supported-numpy :

with NumPy 2.0, it is now actually necessary to use >=2.0 at build time for packages that want to support both NumPy 1.xx and 2.0.

and see https://numpy.org/devdocs/dev/depending_on_numpy.html#adding-a-dependency-on-numpy