💬 Description

enable auto merge for dependabot PRs
when the GitHub dependency bot proposes an update, it should be merge automatically when CI passes.

🧪 How Has This Been Tested?

It's working for another project of mine

✅ Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• [NA] I have made corresponding changes to the documentation
• [NA] I have added tests that prove my fix is effective or that my feature works
• [NA] New and existing unit tests pass locally with my changes