Summary by cubic

Renamed the GitHub Actions workflow file to release-branch.yml to unify naming across workflows. No functional changes to the workflow.

Description

• Summary of changes: Rename only; content unchanged.
• Reasoning: Standardize workflow naming for clarity and easier maintenance.
• Additional context: The workflow’s behavior and triggers remain the same.

Testing

• No tests added or modified; not applicable for a file rename.
• CI should behave as before. After merge, confirm the workflow appears and runs under the new filename in Actions.

^{Written for commit c9f431c. Summary will update on new commits.}