Apply a delay before we enable auto merge on a PR #992
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We saw the auto merging workflow (added in #988) failed in https://github.com/mmtk/mmtk-core/actions/runs/6587030083/job/17896533403. The error message was
GraphQL: Head branch is out of date. Review and try the merge again. (mergePullRequest). It is likely caused by the issue https://github.com/orgs/community/discussions/24462: When a PR gets updated, Github has a process to determine if the PR is mergable. If we attempt to enable auto merge before the process is done, the merge will fail with the error message above. This PR adds a delay and retry for enabling auto merging.