Build with Numpy >= 2.0.0rc1

See https://numpy.org/devdocs/dev/depending_on_numpy.html#numpy-2-0-specific-advice.

Assign unique artifact name to each GitHub Actions job

[actions/upload-artifact@v4](https://github.com/actions/upload-artifact)
no longer supports multiple artifacts with the same name.

Require Fortran compiler, but only for host system

Test built wheels

Remove changelog file

I'm posting changelog data in GitHub releases now.

Add artifact name

Download artifacts to dir where PyPI action expects them

Switch to using PyPI trusted publisher

Update changelog for version 0.1.0