Fix typo in branch name for 2023.2

Change-Id: Ifec735cc7222d49993d8191fb65a1b0a910880d9
diff --git a/.zuul.yaml b/.zuul.yaml
index da61788..6c885b6 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -60,7 +60,7 @@
     name: barbican-tempest-plugin-simple-crypto-2023-2
     parent: barbican-tempest-plugin-simple-crypto
     nodeset: openstack-single-node-jammy
-    override-checkout: stable/2023.1
+    override-checkout: stable/2023.2
     vars:
       devstack_local_conf:
         test-config: