chore: remove unused CI exclude for Python 3.8.0

[bdraco]

What do these changes do?

Removes an exclude line in the CI for Python 3.8.0

This should have been removed when we dropped Python 3.8 support

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4235273) to head (d748c9c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          250       250           
  Branches        53        53           
=========================================
  Hits           250       250           

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