Increase calendar cache time to one hour

aleksis/apps/dashboardfeeds/util/event_feed.py

@@ -68,7 +68,7 @@ def get_current_events(calendar: Calendar, limit: int = 5) -> list:
     return events
 
 
-@cache_memoize(300)
+@cache_memoize(3600)
 def get_current_events_with_cal(calendar_url: str, limit: int = 5) -> list:
     """Get current events.