[AIRFLOW-5694] Check for blinker in Sentry setup (#6365)
[AIRFLOW-5694] Check for blinker in Sentry setup (#6365)


(cherry picked from commit c72c42730236fee1526fcc03dca7f88e1778ee94)

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