Change log message from info to debug (#6227)

- Reduces log verbosity for message which is not typically useful

InvenTree/common/notifications.py

@@ -439,7 +439,7 @@ def trigger_notification(obj, category=None, obj_ref='pk', **kwargs):
         # Set delivery flag
         common.models.NotificationEntry.notify(category, obj_ref_value)
     else:
-        logger.info("No possible users for notification '%s'", category)
+        logger.debug("No possible users for notification '%s'", category)
 
 
 def trigger_superuser_notification(plugin: PluginConfig, msg: str):