fix: Automated branch deletion is not working properly

[f0reachARR]

Description

Abstract

Fix Actions problem that automated branch deletion is not working properly

Background

Related issues
https://github.com/SvanBoxel/delete-merged-branch/issues/257

Details

SvanBoxel/delete-merged-branch is not maintained, and causes error on Release Action.
This PR fixes error by replacing SvanBoxel/delete-merged-branch

[github-actions]

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