Add pyupgrade pre-commit hook

[adamchainz]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (2cd8b4f) to head (2ef6430).
Report is 328 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #665   +/-   ##
=======================================
  Coverage   99.48%   99.48%           
=======================================
  Files           7        7           
  Lines         196      196           
  Branches       42       42           
=======================================
  Hits          195      195           
  Partials        1        1           

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