[v1.14] Use pull_request_target in Update Backport Label workflow #29009
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When the workflow is triggered from a PR opened in a fork, it fails (see here) with the following message:
GraphQL: Resource not accessible by integration (removeLabelsFromLabelable)
To fix this, we need to run the workflow in the context of the pull request base, so the commit changes the event to be
pull_request_target
instead ofpull_request
.Suggested by @aanm