[barbican] Create 2023.2 branch for client and non-client libs

This creates the stable/2023.2 branch for all client and non-client
libraries now that we are past the library freeze.

Note that branching deadline was last week, so please respond as soon
as possible with a +1 (or -1 if for example a gate fixing patch is on
the way).

This patch will be merged, if there is no response from the team before
Friday.

Change-Id: Ia667f29ec67cbdb07696a6375d4285fcb786cc9b

deliverables/bobcat/python-barbicanclient.yaml

@@ -10,3 +10,10 @@ releases:
     projects:
       - repo: openstack/python-barbicanclient
         hash: 7d9c28ab17fec88a93be202bd74f3715195c29e4
+  - version: 5.6.1
+    projects:
+      - repo: openstack/python-barbicanclient
+        hash: 721e9d883807d2872f83b715a5b5a31fdbeb26a3
+branches:
+  - name: stable/2023.2
+    location: 5.6.1