move bobcat to unmaintained

Author: k0ka

.github/workflows/integration_tests.yml

@@ -29,7 +29,7 @@ jobs:
             openstack_version: "stable/2024.1"
             ubuntu_version: "22.04"
           - name: "bobcat"
-            openstack_version: "stable/2023.2"
+            openstack_version: "unmaintained/2023.2"
             ubuntu_version: "22.04"
           - name: "antelope"
             openstack_version: "unmaintained/2023.1"