Update test.yml

[rpgoldman]

Update test.yml to run on modern Emacs (29.3) and with modern python versions.

The original GitHub actions were broken, at least in part because they ran on no-longer-relevant Emacs and Python versions. This commit updates them.

For reviewers: please suggest appropriate versions to test. For now, the only emacs version in test.yml is the one that I have running on my laptop! I don't have a good idea what versions are relevant, but would be happy to update the set if someone can clue me in. The Python versions are more reasonable, I think, but still are open to extension. Or feel free to fix them directly.

[gopar]

Emacs Versions:
-29.4, 29.3, 29.2, 28.2, 28.1, 27.2, 27.1

Python version:

• 3.8, 3.9, 3.10, 3.11, 3.12

Thanks!

[rpgoldman]

Emacs Versions: -29.4, 29.3, 29.2, 28.2, 28.1, 27.2, 27.1

Python version:

* 3.8, 3.9, 3.10, 3.11, 3.12

Thanks!

Done!