Run labeler triage once an hour (#5811)

Instead of every 5 minutes since this seems to eat through the rate
limits pretty quickly if it ends up running.

.github/workflows/triage.yml

@@ -4,11 +4,11 @@ on:
   issues:
     types: ["labeled"]
   schedule:
-    # Run pull request triage every 5 minutes. Ideally, this would be on
+    # Run pull request triage once an hour. 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 * * * *'
+    - cron: '42 * * * *'
 
 concurrency:
   group: issue-triage