Remove support to Python 3.8

[nycholas]

As of 2024-10-07, 3.8 has reached the end-of-life phase of its release cycle. 3.8.20 was the final security release. The codebase for 3.8 is now frozen and no further updates will be provided nor issues of any kind will be accepted on the bug tracker.

https://www.python.org/downloads/release/python-3820/ https://peps.python.org/pep-0569/