Attempt to fix publish workflow

[pgarrison]

Two changes here:

1. Try again to fix the PyPi publish action (following the pattern used in aics-shparam)
2. Remove old python versions from the test matrix because they were failing

[amilworks]

Do you have a GitHub action or step that performs a dry run that checks if everything works?

[pgarrison]

Do you have a GitHub action or step that performs a dry run that checks if everything works?

@amilworks No, the issue is in the integration between (our configuration of) the PyPi publishing action and PyPi, and the PyPi publishing action doesn't appear to have a dry-run mode.