Remove stable/2023.2 job

... because stable/2023.2 reached its EOL.

Change-Id: I86ea4e47d43daad02f285d4fe85dd3c76f539f6c
diff --git a/.zuul.yaml b/.zuul.yaml
index 839a7d4..7dbef74 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -10,7 +10,6 @@
         - barbican-tempest-plugin-simple-crypto-secure-rbac
         - barbican-tempest-plugin-simple-crypto-2024-2
         - barbican-tempest-plugin-simple-crypto-2024-1
-        - barbican-tempest-plugin-simple-crypto-2023-2
         - barbican-tempest-plugin-simple-crypto-ipv6-only
         - barbican-tempest-plugin-simple-crypto-castellan-src
         - barbican-tempest-plugin-simple-crypto-cursive
@@ -87,13 +86,6 @@
     vars: *microversion_v1_1
 
 - job:
-    name: barbican-tempest-plugin-simple-crypto-2023-2
-    parent: barbican-tempest-plugin-simple-crypto
-    nodeset: openstack-single-node-jammy
-    override-checkout: stable/2023.2
-    vars: *microversion_v1_1
-
-- job:
     name: barbican-tempest-plugin-simple-crypto-yoga
     parent: barbican-tempest-plugin-simple-crypto
     nodeset: openstack-single-node-focal