[AIRFLOW-2731] Raise psutil restriction to <6.0.0
[AIRFLOW-2731] Raise psutil restriction to <6.0.0

Closes #3585 from gwax/upgrade_psutil

lxneng/incubator-airflow,lxneng/incubator-airflow,lxneng/incubator-airflow,lxneng/incubator-airflow