Run actions/stale every 15 minutes

Author: andyleejordan

.github/workflows/close-stale-issues.yml

@@ -5,7 +5,7 @@ permissions:
 
 on:
   schedule:
-    - cron: '0 * * * *' # Every hour on the hour
+    - cron: '*/15 * * * *'
 
 jobs:
   stale-resolved-issues: