Fix merge bot to use ref for merged PR #6416
Dr.CI classification results
{"FAILED":[{"workflowId":11448846656,"workflowUniqueId":65998012,"id":31853218515,"runnerName":"i-08e0f069963655c32","authorEmail":"[email protected]","name":"Build documentation / build (buck2) / Build doc","jobName":"build (buck2) / Build doc","conclusion":"failure","completed_at":"2024-10-21T21:22:36.000000000Z","html_url":"https://github.com/pytorch/executorch/actions/runs/11448846656/job/31853218515","head_branch":"gh/kirklandsign/6/head","pr_number":6416,"head_sha":"0971e639a47ed1663e71b4b8fcc8fe3e389913c2","head_sha_timestamp":"2024-10-21T21:21:30.000000000Z","failure_captures":["##[error]No files were found with the provided path: /home/ec2-user/actions-runner/_work/_temp/artifacts/. No artifacts will be uploaded."],"failure_lines":["##[error]No files were found with the provided path: /home/ec2-user/actions-runner/_work/_temp/artifacts/. No artifacts will be uploaded."],"failure_context":[],"time":"2024-10-21T21:21:39.000000000Z"}],"FLAKY":[],"BROKEN_TRUNK":[],"UNSTABLE":[]}