Revert "CI: Use 2023.2 image for rabbitmq on ipv6 scenario"

This reverts commit 0ec71d87.

Reason for revert: fixed now

Change-Id: I33d62e910ff6151eb03c814ee7b8984c6f4e5308

tests/templates/globals-default.j2

@@ -267,10 +267,3 @@ enable_skyline: "yes"
 enable_skyline: "yes"
 skyline_enable_sso: "yes"
 {% endif %}
-
-{# Workaround for https://github.com/rabbitmq/rabbitmq-server/issues/10728 #}
-{% if address_family == 'ipv6' %}
-{% raw %}
-rabbitmq_tag: "2023.2-{{ kolla_base_distro }}-{{ kolla_base_distro_version }}{{ openstack_tag_suffix }}"
-{% endraw %}
-{% endif %}