@- mention wg-infra on failed post-promote jobs (#1185)

Author: danielrozenberg

.github/workflows/post-promote-tasks.yml

@@ -106,6 +106,6 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.ACCESS_TOKEN }}
           WORKFLOW_NAME: ${{ github.workflow }}
-          MENTION: '@estherkim' #TODO(estherkim): switch to infra team once debug complete
+          MENTION: '@ampproject/wg-infra'
           REPO_SLUG: ${{ github.repository }}
           RUN_ID: ${{ github.run_id }}