ipatests: Increase timeout for ACME in gating.yaml
    
    Increase to 7200 from 3600 to match other executions.
    
    Related: https://pagure.io/freeipa/issue/8581
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Mohammad Rizwan <myusuf@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
    Reviewed-By: Armando Neto <abiagion@redhat.com>