Add zizmorify configuration

[samdark]

Summary

• add the zizmorify GitHub Actions security analysis workflow
• add Dependabot updates for GitHub Actions

Testing

• verified the files match Seldaek/zizmorify assets

[Copilot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.36%. Comparing base (0811888) to head (df7584e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #558      +/-   ##
============================================
+ Coverage     17.97%   18.36%   +0.39%     
  Complexity      657      657              
============================================
  Files            78       78              
  Lines          3600     3496     -104     
============================================
- Hits            647      642       -5     
+ Misses         2953     2854      -99     

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