DEP: refactored out runtime dependency on setuptools

[neutrinoceros]

Context:

• pkg_resources, which is part of setuptools, is de facto a runtime dependency of astroquery
• it is not declared as such: I suspect the reason this has not been a problem (yet) in CI is that some test dependency (likely pytest-doctestplus via pytest-astropy) pulls it in. I'm working on eliminating this dependency from the stack, see DEP: refactored out runtime dependency on setuptools scientific-python/pytest-doctestplus#258
• pkg_resources is also deprecated as an API (see https://setuptools.pypa.io/en/latest/pkg_resources.html)

I followed the upstream migration guide here.

[pep8speaks]

Hello @neutrinoceros! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2024-07-19 16:06:35 UTC

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.44%. Comparing base (26050ed) to head (61adcf2).
Report is 23 commits behind head on main.

Files	Patch %	Lines
astroquery/alma/core.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3071      +/-   ##
==========================================
- Coverage   67.55%   67.44%   -0.11%     
==========================================
  Files         233      233              
  Lines       18327    18370      +43     
==========================================
+ Hits        12380    12390      +10     
- Misses       5947     5980      +33     

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[ceb8]

Thanks @neutrinoceros !