Revert "Temporarily disable subscribe to label"

This reverts commit 8e21cfef88.

.github/workflows/subscribe-to-label.yml

@@ -2,13 +2,12 @@ name: "Subscribe to Label"
 on:
   issues:
     types: ["labeled"]
-  # Temporarily disabled until we fix the bot...
-  # schedule:
-  #   # Run pull request triage every 5 minutes. Ideally, this would be on
-  #   # "labeled" types of pull request events, but that doesn't work if the pull
-  #   # request is from another fork. For example, see
-  #   # https://github.com/actions/labeler/issues/12
-  #   - cron: '*/5 * * * *'
+  schedule:
+    # Run pull request triage every 5 minutes. Ideally, this would be on
+    # "labeled" types of pull request events, but that doesn't work if the pull
+    # request is from another fork. For example, see
+    # https://github.com/actions/labeler/issues/12
+    - cron: '*/5 * * * *'
 jobs:
   triage:
     runs-on: ubuntu-latest