bump openstack cli to get working FIP commands

Author: sjpb

requirements.txt

@@ -1,6 +1,6 @@
 ansible==6.7.0 # cloudalchemy.prometheus uses ansible.builtin.include, removed in ansible-core==2.16 => ansible==9
 openstacksdk
-python-openstackclient==6.6.1 # v7.0.0 has a bug re. rebuild
+python-openstackclient==8.0.0
 python-manilaclient
 python-ironicclient
 jmespath