Don't cover typing.TYPE_CHECKING

[hugovk]

Also add zizmor to pre-commit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (767c7cb) to head (88b904e).
Report is 51 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   98.95%   99.47%   +0.51%     
==========================================
  Files          11       11              
  Lines         767      760       -7     
==========================================
- Hits          759      756       -3     
+ Misses          8        4       -4     

Flag	Coverage Δ
macos-latest	97.89% <ø> (+0.50%)	⬆️
ubuntu-latest	97.89% <ø> (+0.50%)	⬆️
windows-latest	96.44% <ø> (+0.48%)	⬆️

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