run every 8 hours the stale bot to provide faster reaction to changes

Signed-off-by: Matthieu Gallien <matthieu_gallien@yahoo.fr>

.github/workflows/stale.yml

@@ -1,7 +1,7 @@
 name: 'Close stale issues'
 on:
     schedule:
-        -   cron: '30 1 * * *'
+        -   cron: '30 */8 * * *'
 
 jobs:
     stale: