Update prepare_release.py to fetch the original PR of each backport PR #2357
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Update
prepare_release.py
to fetch the original PR of each backport PR, e.g. #2354 instead of #2355.Note: the fix relies on backport PRs having
head.ref
that starts withbackport-{ORIGINAL_PR_NUM}
(e.g.backport-2354-to-release-2.3
).TYPE: NO_HISTORY