Update to python 3.12 for testing

[dlakaplan]

No description provided.

[dlakaplan]

https://docs.python.org/3/whatsnew/3.12.html
This means that distutils, setuptools, pkg_resources, and easy_install will no longer available by default; to access these run pip install setuptools in the [activated](https://docs.python.org/3/library/venv.html#venv-explanation) virtual environment.
so have to add these explicitly.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (0201737) 68.33% compared to head (3cd2097) 68.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1652      +/-   ##
==========================================
+ Coverage   68.33%   68.35%   +0.01%     
==========================================
  Files         104      104              
  Lines       24112    24112              
  Branches     4280     4300      +20     
==========================================
+ Hits        16478    16482       +4     
+ Misses       6549     6548       -1     
+ Partials     1085     1082       -3     

see 2 files with indirect coverage changes

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[dlakaplan]

@paulray : this required a couple of tweaks because of how setuptools is now included. But I think it works. Should we change our default tests to use 3.12 or just keep it as a demo?

[paulray]

Well, we have oldestdeps on Python 3.8 and the oldest packages we support, so I think it makes sense to have the tests also run on the most recent versions to catch any compatibility issues that crop up. I'd go with 3.12 for our tests.

[abhisrkckl]

I'll merge this if ready.

[dlakaplan]

I think so.