Update CI with recent Python versions

Version 4.1.1.dev0

Release 4.1.0

Accept arguments such as --directory via environment variables (Fixes #553)

revert to default funding file #nolog

Fix: minor typos (#552)

add a .readthedocs.yml configuration #nolog

Version 4.0.8.dev0

Release 4.0.7

Check g.x_arg exists before working on it (#541)

Version 4.0.7.dev0

Release 4.0.6

Add --purge flag to the stamp command (#540)

Migrate Python package metadata to pyproject.toml

Accept -x options for all db commands (Fixes #438)