Python 3.14 support

[steven-murray]

Currently pyuvdata cannot be installed on python 3.14 because of the restriction of numba <0.63 which restricts llvmlite to <0.46 (which is the first version that supports 3.14). Can we lift this?

[bhazelton]

Yes, but it might take a little work.

From the comment in our pyproject.toml, the restriction is in there because of a problem with numba wheel availability for intel based macs. I don't think we want to drop that support yet (we have a lot of users using intel based macs), so we need to figure out how to navigate this. My memory is that the lack of wheel support broke mac builds, but maybe things will work better now if we just change it. Or maybe we'll need to do a little work to figure out how to configure things so the builds don't break.

[bhazelton]

Ok, I made a draft PR. Things are failing but I haven't had time to dig in and figure out why. @steven-murray feel free to poke at it, I'm not sure I'll get to it before I leave for vacation in 2 days.