[AIRFLOW-XXX] Use .sha512 for signature
[AIRFLOW-XXX] Use .sha512 for signature

As requested by the IPMC

(cherry picked from commit a54f74821e161fd9e5423f5cfebaeab43a021422)
Signed-off-by: Bolke de Bruin <17f52a69a3ba26c79c8a88ef8c1f26312d9cbf0e@xs4all.nl>

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