Drop support for Python 3.8

[hugovk]

Python 3.8 is end-of-life next month:

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0569/#lifespan

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.62%. Comparing base (92e3f51) to head (1ca4864).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #448   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files           8        8           
  Lines         808      808           
=======================================
  Hits          805      805           
  Misses          3        3           

Flag	Coverage Δ
macos-latest	99.62% <ø> (ø)
ubuntu-latest	99.62% <ø> (ø)
windows-latest	?

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