[AIRFLOW-6189] Reduce the maximum test duration to 8 minutes (#6744)
[AIRFLOW-6189] Reduce the maximum test duration to 8 minutes (#6744)


(cherry picked from commit a873de4366e43dee9d1d5b3ef019ab3234545fbf)

owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow