Disable secrets-outside-env audit

[martincostello]

This isn't appropriate in most cases as there's no logical environment, and environments are already used in cases where they are.

[Copilot]

Pull request overview

This PR updates the repository’s zizmor configuration to disable the secrets-outside-env audit, aiming to avoid findings in workflows that don’t have a meaningful GitHub “environment”.

Changes:

• Disable the secrets-outside-env zizmor rule in the repo-level config.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.93%. Comparing base (b03fdec) to head (cf17ffa).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3823   +/-   ##
=======================================
  Coverage   94.93%   94.93%           
=======================================
  Files         111      111           
  Lines        3886     3886           
  Branches      784      784           
=======================================
  Hits         3689     3689           
  Misses        197      197           

Flag	Coverage Δ
Linux	94.93% <ø> (ø)
Windows	94.93% <ø> (ø)
macOS	94.93% <ø> (ø)

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