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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.82%. Comparing base (4d943b0) to head (a1b966c).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #72   +/-   ##
=========================================
  Coverage     96.82%   96.82%           
  Complexity       54       54           
=========================================
  Files             3        3           
  Lines           126      126           
=========================================
  Hits            122      122           
  Misses            4        4           

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