Fixup CI

[parona-source]

Description

Fixes CI so that it runs and passes.

See https://github.com/dbcli/mycli/pull/1153

Checklist

• [ ] I've added this contribution to the changelog.md.
• [x] I've added my name to the AUTHORS file (or it's already there).

[parona-source]

The os matrix could be removed as well and just use some singular Ubuntu LTS version for the runner.

A future task would be to move to PEP517 and stop using setup.py.