ENH: Add aarch64 wheels

[larsoner]

Closes #216

1. Update OS defs to -latest in accordance with cibuildwheel docs...
2. ...Except for macos, where you can triage based on native Intel and arm64 hardware now
3. Move arm64 to the "speedy" path used by Linux, I think it might be fast enough but we'll see 🤞
4. Add aarch64, with separate builds per Python because it will be slow (it uses emulation)
5. EDIT: Build against NumPy 2.0

[larsoner]

Okay added another point:

• Build against NumPy 2.0 for compat with 2.0 and 1.x

So after this PR is merged I'd suggest a fairly quick release because NumPy 2.0 is going to drop soon and nitime on PyPI will be incompatible 😓

[larsoner]

@arokem seems to be working!

[arokem]

Thanks @larsoner! I'll add you as a maintainer to increase the bus factor...

[hoechenberger]

Amazing! Thanks!

[hoechenberger]

It would be fantastic if you could cut a new release 👍