chore: add workflow_dispatch to security-code-scanner

[metamaskbot]

Summary

This pull request updates the Security Code Scanner by adding the workflow_dispatch trigger. This trigger allows for the Code Scanner to be manually triggered from your repository's Action tab.

For further questions, please contact the MetaMask Security team.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.93%. Comparing base (911d29a) to head (8eac57f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3170   +/-   ##
=======================================
  Coverage   94.93%   94.93%           
=======================================
  Files         507      507           
  Lines       11184    11184           
  Branches     1722     1722           
=======================================
  Hits        10618    10618           
  Misses        566      566           

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