Update zizmor

[martincostello]

Update zizmor to 1.18.0.

[Copilot]

Pull request overview

This PR updates the zizmor tool version from 1.16.3 to 1.18.0 in the GitHub Actions lint workflow.

• Updates the ZIZMOR_VERSION environment variable to use the newer version

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (4ae817b) to head (c6635ab).
⚠️ Report is 3 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3695   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files         111      111           
  Lines        3858     3858           
  Branches      778      778           
=======================================
  Hits         3652     3652           
  Misses        206      206           

Flag	Coverage Δ
Linux	94.66% <ø> (ø)
Windows	94.66% <ø> (ø)
macOS	94.66% <ø> (ø)

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