Harden GitHub workflows

[samdark]

Summary

• Pin reusable yiisoft/actions workflows to a commit SHA.
• Replace the Rector workflow pull_request_target trigger with pull_request.
• Set read-only GITHUB_TOKEN permissions for read-only workflows.

Validation

• zizmor --no-progress --no-exit-codes auth/.github/workflows

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-zizmor-workflows

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.87%. Comparing base (1490200) to head (c2ab55e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #108   +/-   ##
=========================================
  Coverage     95.87%   95.87%           
  Complexity       77       77           
=========================================
  Files            10       10           
  Lines           194      194           
=========================================
  Hits            186      186           
  Misses            8        8           

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