Change git config user for GitHub Actions

[nev21]

No description provided.

[Copilot]

Pull request overview

This PR updates the git configuration in the sync-rush-versions workflow to use the standard "github-actions[bot]" identity instead of "dependabot-sync[bot]", and removes the unnecessary --global flag from the git config commands.

• Changed git user identity from "dependabot-sync[bot]" to "github-actions[bot]"
• Removed --global flag from git config commands to use repository-scoped configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.03%. Comparing base (df995c2) to head (d8c9423).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #415   +/-   ##
=======================================
  Coverage   99.03%   99.03%           
=======================================
  Files          19       19           
  Lines         727      727           
  Branches      183      183           
=======================================
  Hits          720      720           
  Misses          7        7           

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