Drop support for python 3.8

[schwehr]

Describe the feature request

Following up to #276 and #225, Python 3.8 became end-of-life on 2024-10-07. It would be good to drop support for it. That allows for additional cleanup.

https://devguide.python.org/versions/

Contributions

• I am interested in implementing the described feature request and submit as a PR.

[JamesParrott]

Hi Kurt. Thanks for the nudge. I've had a lot on, but I'll pick this up again now. Hopefully a way forward will be agreed in the very near future.

[saulpw]

Thanks for the ping, this is fine by me and VisiData. (Other software can 👍 this if it's not a problem for them too.)