update constraint for castellan to new release 5.6.0

This breaks barbican unit tests, so make the cross-barbican job
non-voting until [0] gets merged.

[0] https://review.opendev.org/c/openstack/barbican/+/978322

meta: version: 5.6.0
meta: team: oslo
meta: diff-start: -
meta: series: gazpacho
meta: branch: master
meta: release-type: release
meta: pypi: no
meta: first: no
meta: release:Author: Elod Illes <elod.illes@est.tech>
meta: release:Commit: Takashi Kajinami <kajinamit@oss.nttdata.com>
meta: release:Change-Id: If2f9f4eb688386b497d381924ae75cfe0f3cd92b
meta: release:Workflow+1: Elod Illes <elod.illes@est.tech>
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
Depends-on: https://review.opendev.org/c/openstack/manila/+/978319
Change-Id: I0a2acad20273b12cd96f6b16deafcc3fe3edff2f
Signed-off-by: OpenStack Proposal Bot <openstack-infra@lists.openstack.org>
Generated-By: openstack/project-config:roles/copy-release-tools-scripts/files/release-tools/update_constraints.sh

Author: OpenStack Proposal Bot

.zuul.d/project.yaml

@@ -21,7 +21,8 @@
         - requirements-tox-validate-projects:
             voting: false
         - cross-aodh-py312
-        - cross-barbican-py312
+        - cross-barbican-py312:
+            voting: false
         - cross-ceilometer-py312
         - cross-cinder-py312
         - cross-designate-py312

upper-constraints.txt

@@ -240,7 +240,7 @@ ldappool===3.0.0
 hpack===4.1.0
 joblib===1.5.3
 google-api-python-client===2.190.0
-castellan===5.5.0
+castellan===5.6.0
 oslo.versionedobjects===3.9.0
 enmerkar===0.7.1
 webcolors===25.10.0