use plural form of the unit

Author: tschaffter

openchallenges/data_integration_stack.py

@@ -59,7 +59,7 @@ def __init__(self, scope: Construct, id: str, **kwargs) -> None:
             flexible_time_window=scheduler.CfnSchedule.FlexibleTimeWindowProperty(
                 mode="OFF",
             ),
-            schedule_expression="rate(5 minute)",
+            schedule_expression="rate(5 minutes)",
             group_name=schedule_group.name,
             target=scheduler.CfnSchedule.TargetProperty(
                 arn=event_bus.event_bus_arn,