chore: update branch references to main

[marandaneto]

💡 Motivation and Context

This repo was still using master as the default branch. This updates the workflow and release references that still pointed at master so the repository can use main consistently.

💚 How did you test it?

• Ran git diff --check
• Searched the repo for remaining branch-name references with rg '\bmaster\b'

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Added the release label to the PR
• Added exactly one version bump label: bump-patch, bump-minor, or bump-major