openstack-base: Pin tooz to 5.0.0

tooz 6.0.0 is now in u-c and it broke redis, see [1].
tooz 6.0.1 did not help and 6.0.2 is in the works, see [2].

[1]: https://review.opendev.org/c/openstack/tooz/+/911648
[2]: https://lists.openstack.org/archives/list/[email protected]/thread/HHNJ3XZR3DLSFIWXK2TZ3R7QSMMFFVPU/

Change-Id: If9ecf4a7fe703cfb87d4559790b39a5703ae49c4

Author: mnasiadka

docker/openstack-base/Dockerfile.j2

@@ -198,6 +198,10 @@ RUN ln -s openstack-base-source/*requirements* /requirements \
                     in venv (see https://launchpad.net/bugs/1961874).
 #}
     && {{ macros.upper_constraints_remove("ovs") }} \
+{# NOTE(mnasiadka): Override tooz to 5.0.0 - see
+                    https://review.opendev.org/c/openstack/tooz/+/911648
+#}
+    && {{ macros.upper_constraints_version_change('tooz', '6.0.0', '5.0.0') }} \
     && mkdir -p /var/lib/kolla \
     && python3 -m venv --system-site-packages /var/lib/kolla/venv