ci: Avoid release-plz closing PRs unnecessarily
#2472
Merged
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If two instances of the
release-plzworkflow ran at the same time (due to multiple rust PRs being merged together), the newer one may try to update the release branch with stale ref info, and resort to re-creating the release PR instead.This change avoids that situation by ensuring no two instances of the workflow run concurrently for the same branch.