[sahara-tests] Tag ussuri-last & victoria-last

Ussuri and Victoria branches are in Extended Maintenance[1].
Once any stable branch is moved to EM state then, Tempest and
its plugins needs to be released[2] so that we have the compatible
tags to test the EM stable branches[3].

We taged ussuri-last & victoria-last for tempest[4] but forgot to do
it for the tempest plugins. Using the tag 0.15.0 hash which is compatible
for tempest ussuri-last and victoria-last.

[1] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html
[2] https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html
[3] https://review.opendev.org/c/openstack/releases/+/843039

Change-Id: Ie3f45da86e426070651ce3fbb01b4c20aba7456e

deliverables/ussuri/sahara-tests.yaml

@@ -11,3 +11,7 @@ releases:
     projects:
       - repo: openstack/sahara-tests
         hash: 53f70d9d9290e1bd267eec095eaa40408bb6ac2a
+  - version: ussuri-last
+    projects:
+      - repo: openstack/sahara-tests
+        hash: 98063d3fd93ce77cb3ecbbd33868bbe5dd3a6865

deliverables/victoria/sahara-tests.yaml

@@ -12,3 +12,7 @@ releases:
     projects:
       - repo: openstack/sahara-tests
         hash: 51817cc5821363142457c7cdccb59d31de765fa0
+  - version: victoria-last
+    projects:
+      - repo: openstack/sahara-tests
+        hash: 98063d3fd93ce77cb3ecbbd33868bbe5dd3a6865