ci: Change workflow branch from main to master

  Update the GitHub Actions workflow in changelog.yml to switch the target branch from main to master.

Author: jorben

.github/workflows/changelog.yml

@@ -39,6 +39,6 @@ jobs:
       - name: Commit CHANGELOG.md
         uses: stefanzweifel/git-auto-commit-action@v4
         with:
-          branch: main
+          branch: master
           commit_message: 'docs: update CHANGELOG.md for ${{ github.ref_name }} [skip ci]'
           file_pattern: CHANGELOG.md