The pull request has only one (non-merge) commit and in this case Github will use it as the default commit message when merging. The pull request title doesn't match the commit though ("chore(deps): Bump amannn/action-semantic-pull-request from 5.4.0 to 5.5.0" vs. "chore(deps): Bump amannn/action-semantic-pull-request"). Please update the pull request title accordingly to avoid surprises.