Fix reading the PR number in the PR labeler action

Author: katiewasnothere

.github/workflows/pr-label-apply.yml

@@ -29,7 +29,6 @@ jobs:
           run-id: ${{ github.event.workflow_run.id }}
           pattern: pr-metadata-*
           merge-multiple: false
-        continue-on-error: true
         id: download-artifact
 
       - name: Read PR number