Add Python 3.13, remove Python 3.8

[jodal]

• Use Python 3.13 as the primary version
• Remove support for Python 3.8
• Use Annotated from typing instead of typing_extensions
• Use Generator and Iterator from collections.abc
• Use dict/list/tuple in types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bdc9f94) to head (bc45434).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #78   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          359       360    +1     
  Branches        21         9   -12     
=========================================
+ Hits           359       360    +1     

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