Add Opencast 12.11 to cron

Author: mtneug

.github/workflows/cron.yml

@@ -28,13 +28,13 @@ jobs:
             opencast_version: '13.3'
             push_major: 'false'
           - day_of_week: '4'
-            opencast_version: '12.10'
+            opencast_version: '12.11'
             push_major: 'false'
           - day_of_week: '5'
-            opencast_version: '12.9'
+            opencast_version: '12.10'
             push_major: 'false'
           - day_of_week: '6'
-            opencast_version: '12.8'
+            opencast_version: '12.9'
             push_major: 'false'
 
     steps: