fix: make DIRECTORY workflow compatible with protected master

[nickzerjeski]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

This updates .github/workflows/UpdateDirectory.yml so it no longer attempts direct pushes to protected master.
Instead, it opens a PR containing the generated DIRECTORY.md update.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

Fixes #1219

[Copilot]

Pull request overview

This PR updates the UpdateDirectory GitHub Actions workflow so DIRECTORY.md updates are proposed via an automated pull request instead of attempting to commit/push directly to a protected master branch.

Changes:

• Update workflow trigger to run on pushes to master.
• Replace direct git commit && git push with peter-evans/create-pull-request to open a PR containing only DIRECTORY.md changes.
• Add explicit workflow token permissions needed to create branches/commits and open PRs.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.91%. Comparing base (5c39e87) to head (c67cc87).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1893   +/-   ##
=======================================
  Coverage   85.91%   85.91%           
=======================================
  Files         379      379           
  Lines       19778    19778           
  Branches     3016     3016           
=======================================
  Hits        16993    16993           
  Misses       2785     2785           

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