Cap cinder-tempest-plugin version for stable/train

We are capping stable/train testing with Tempest
26.1.0 (choosing 26.1.0 because of bug#1955418)
- https://review.opendev.org/c/openstack/tempest/+/822339

To have compatible cinder-tempest-plugin version for
Tempest 26.1.0 and stable/train testing, we need to cap
it with 1.3.0.

Change-Id: I6378c644fada27b6945c7953ccfd78e24e62071c

.zuul.yaml

@@ -225,7 +225,8 @@
         * legacy-tempest-dsvm-lvm-multibackend
     timeout: 10800
     required-projects:
-      - opendev.org/openstack/cinder-tempest-plugin
+      - name: opendev.org/openstack/cinder-tempest-plugin
+        override-checkout: 1.3.0
     vars:
       tox_envlist: all
       tempest_test_regex: '(?!.*\[.*\bslow\b.*\])(^tempest\.(api|scenario)|(^cinder_tempest_plugin))'