fix: prevent duplicate auth header in GitHub Actions workflow

[DenizAltunkapan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
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This PR updates the directory markdown generation workflow to disable automatic GitHub token persistence during checkout, preventing the "duplicate Authorization header" error when creating pull requests.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.51%. Comparing base (fa8ea8e) to head (006a94c).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7091   +/-   ##
=========================================
  Coverage     78.50%   78.51%           
+ Complexity     6752     6751    -1     
=========================================
  Files           759      759           
  Lines         22402    22402           
  Branches       4400     4400           
=========================================
+ Hits          17587    17588    +1     
+ Misses         4109     4108    -1     
  Partials        706      706           

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