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 99.52%. Comparing base (68a2299) to head (18f1a09).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #308   +/-   ##
=========================================
  Coverage     99.52%   99.52%           
  Complexity      313      313           
=========================================
  Files            19       19           
  Lines           838      838           
=========================================
  Hits            834      834           
  Misses            4        4           

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