CI: update rolling-upgrade jobs

Bobcat went EOL recently; add Epoxy job.

Related-Change: https://review.opendev.org/c/openstack/releases/+/948240
Change-Id: Ibad603c4a07d49ce55dce26d1af4c506d95b193f

.zuul.yaml

@@ -467,7 +467,7 @@
     name: swift-multinode-rolling-upgrade-bobcat
     parent: swift-multinode-rolling-upgrade
     vars:
-      previous_swift_version: origin/stable/2023.2
+      previous_swift_version: 2023.2-eol
 
 - job:
     name: swift-multinode-rolling-upgrade-caracal
@@ -481,6 +481,12 @@
     vars:
       previous_swift_version: origin/stable/2024.2
 
+- job:
+    name: swift-multinode-rolling-upgrade-epoxy
+    parent: swift-multinode-rolling-upgrade
+    vars:
+      previous_swift_version: origin/stable/2025.1
+
 - job:
     name: swift-multinode-rolling-upgrade-master
     parent: swift-multinode-rolling-upgrade
@@ -767,6 +773,7 @@
         - swift-multinode-rolling-upgrade-bobcat
         - swift-multinode-rolling-upgrade-caracal
         - swift-multinode-rolling-upgrade-dalmatian
+        - swift-multinode-rolling-upgrade-epoxy
         - swift-multinode-rolling-upgrade-master:
             branches: master