Update to 5.0.8
    
    Update done because of bug [1] fix needed.
    Also following xena u-c file change[2].
    
    [1] https://bugs.launchpad.net/oslo.messaging/+bug/1949964
    [2] https://review.opendev.org/c/openstack/requirements/+/823104
    
    Related-to: https://review.rdoproject.org/r/q/I06b8a08f9894928aef32174b3f5a6fa80771f386