Update Github actions to new versions and runon Python 3.8+.

[moorepants]

No description provided.

[moorepants]

nosetests fails with Python 3.12:

Traceback (most recent call last):
  File "/home/runner/miniconda3/envs/yeadon-dev/bin/nosetests", line 6, in <module>
    from nose import run_exit
  File "/home/runner/miniconda3/envs/yeadon-dev/lib/python3.12/site-packages/nose/__init__.py", line 1, in <module>
    from nose.core import collector, main, run, run_exit, runmodule
  File "/home/runner/miniconda3/envs/yeadon-dev/lib/python3.12/site-packages/nose/core.py", line 12, in <module>
    from nose.loader import defaultTestLoader
  File "/home/runner/miniconda3/envs/yeadon-dev/lib/python3.12/site-packages/nose/loader.py", line 21, in <module>
    from nose.importer import Importer, add_path, remove_path
  File "/home/runner/miniconda3/envs/yeadon-dev/lib/python3.12/site-packages/nose/importer.py", line 12, in <module>
    from imp import find_module, load_module, acquire_lock, release_lock
ModuleNotFoundError: No module named 'imp'
Error: Process completed with exit code 1.

Should probably switch to pytest, since nose is dead.

[moorepants]

pytest errors:

(yeadon-dev) moorepants@nandi:yeadon(new-dep-versions)$ pytest yeadon
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.12.3, pytest-8.2.2, pluggy-1.5.0
rootdir: /home/moorepants/src/yeadon
collected 17 items / 2 errors                                                                                                                                                                

=========================================================================================== ERRORS ===========================================================================================
________________________________________________________________________ ERROR collecting yeadon/tests/test_human.py _________________________________________________________________________
ImportError while importing test module '/home/moorepants/src/yeadon/yeadon/tests/test_human.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../miniconda/envs/yeadon-dev/lib/python3.12/importlib/__init__.py:90: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
yeadon/tests/test_human.py:9: in <module>
    import nose
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/__init__.py:1: in <module>
    from nose.core import collector, main, run, run_exit, runmodule
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/core.py:12: in <module>
    from nose.loader import defaultTestLoader
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/loader.py:21: in <module>
    from nose.importer import Importer, add_path, remove_path
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/importer.py:12: in <module>
    from imp import find_module, load_module, acquire_lock, release_lock
E   ModuleNotFoundError: No module named 'imp'
________________________________________________________________________ ERROR collecting yeadon/tests/test_solid.py _________________________________________________________________________
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/_pytest/runner.py:341: in from_call
    result: Optional[TResult] = func()
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/_pytest/runner.py:389: in collect
    return list(collector.collect())
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/_pytest/unittest.py:90: in collect
    self.session._fixturemanager.parsefactories(self.newinstance(), self.nodeid)
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/_pytest/unittest.py:75: in newinstance
    return self.obj("runTest")
E   TypeError: StadiumSolidCheck.__init__() missing 5 required positional arguments: 'thick0', 'rad0', 'thick1', 'rad1', and 'height'
====================================================================================== warnings summary ======================================================================================
../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/plugins/manager.py:418
  /home/moorepants/miniconda/envs/yeadon-dev/lib/python3.12/site-packages/nose/plugins/manager.py:418: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
    import pkg_resources

../../miniconda/envs/yeadon-dev/lib/python3.12/site-packages/pkg_resources/__init__.py:2825
  /home/moorepants/miniconda/envs/yeadon-dev/lib/python3.12/site-packages/pkg_resources/__init__.py:2825: DeprecationWarning: Deprecated call to `pkg_resources.declare_namespace('sphinxcontrib')`.
  Implementing implicit namespace packages (as specified in PEP 420) is preferred to `pkg_resources.declare_namespace`. See https://setuptools.pypa.io/en/latest/references/keywords.html#keyword-namespace-packages
    declare_namespace(pkg)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================================== short test summary info ===================================================================================
ERROR yeadon/tests/test_human.py
ERROR yeadon/tests/test_solid.py::StadiumSolidCheck - TypeError: StadiumSolidCheck.__init__() missing 5 required positional arguments: 'thick0', 'rad0', 'thick1', 'rad1', and 'height'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=============================================================================== 2 warnings, 2 errors in 0.81s ================================================================================