Use token with appropriate privileges

Author: cwickham

.github/workflows/update-prerelease-reference.yml

@@ -148,6 +148,6 @@ jobs:
       - name: Trigger preview deployment
         if: steps.should-update.outputs.update == 'true'
         env:
-          GH_TOKEN: ${{ github.token }}
+          GH_TOKEN: ${{ secrets.ISSUE_COMMENT_TRIGGER_PAT }}
         run: |
           gh pr comment "${{ steps.create-pr.outputs.pr_url }}" --body "/deploy-preview"