[stable-only] Use os-brick from source in wallaby

We had an issue in os-brick that caused a failure of
nova-ceph-multistore. This problem was already fixed in os-brick
stable/wallaby [1], but wallaby has transitioned into EM and we
can't release os-brick wallaby anymore.

To fix the nova-ceph-multistore job this patch adds os-brick as
a required project for the affected job, so it will fetch
os-brick from source and not the released version.

[1] https://review.opendev.org/c/openstack/os-brick/+/864479
[2] https://review.opendev.org/c/openstack/cinder/+/864916

Change-Id: Ie924260f0d558f83b1d266f0ca41cbeeaf7d2409

Author: MrStupnikov

.zuul.yaml

@@ -405,6 +405,7 @@
     irrelevant-files: *dsvm-irrelevant-files
     required-projects:
       - openstack/nova
+      - openstack/os-brick
     pre-run:
       - playbooks/ceph/glance-copy-policy.yaml
     vars: