TST: switch all jobs to Python 3.13

[neutrinoceros]

This is an experimental/explorative PR to survey compatibility with Python 3.13 downstream of the core lib. I intend to offer help where (and if) necessary.

Status:

• meta: requiringastropy[all] in this CI is blocked by [Python][Packaging] Support Python 3.13 and upload wheels apache/arrow#43519 (but can be worked around or maybe even removed as it doesn't seem needed for most packages)
• astroquery is blocked by mocpy Support python 3.13 cds-astro/mocpy#179
• ccdproc has one very minor incompatibility with NumPy 2.0 (which is already patched on the dev branch), nothing to see here
• reproject may actually need something from astropy[all] that's not in astropy[recommended] (test collection fails with E ModuleNotFoundError: No module named 'gwcs')
• sunpy has two distinct failure modes:
  • sunpy 6.0.2 fails with ModuleNotFoundError: No module named 'cgi' (blocked by zeep, the patch was merged but never released Get rid of deprecated cgi module. mvantellingen/python-zeep#1364)
  • sunpy-dev fails to compile (surprising, since it's using Python's Limited API, and uv build -p 3.13 works fine on my system)

[neutrinoceros]

trying out running with astropy[recommended] instead of astropy[all] to avoid requiring pyarrow in CI for now

[neutrinoceros]

pyarrow 1.18.0 is out now. Let's try this again.

[neutrinoceros]

The problem with reproject persists even though I'm back to including astropy[all]

[neutrinoceros]

mocpy now has a 3.13-compatible release so I expect astroquery to go green, let's see if anythin else does

[neutrinoceros]

results:

• astroquery-dev indeed turned green
• so did reproject
• meanwhile, specreduce has one new failing test, though it's already known: astropy v7.0 incompatibility in TestMasksTracing.test_fit_trace_all_nan_cols specreduce#229