[magnum] Transition 2023.1 Antelope to Unmaintained

This branch reached the end of its official stable maintained period,
hence this patch transition stable/2023.1 branch to Unmaintained. (For
details about Unmaintained state please see: [1][2])

The transitions is as follows:
- tip of the stable/2023.1 branch is tagged with 2023.1-eom tag
- unmaintained/2023.1 branch will be cut from 2023.1-eom tag
- stable/2023.1 branch will be deleted

Note:
- there will no longer be official releases off of 2023.1 branch after
  this transition
- backports can be pushed to unmaintained/2023.1 branch
- openstack-unmaintained-core (or <project>-unmaintained-core groups if
  such exists) have the rights to merge patches

Important: please +1 if the team is ready for us to proceed with this
transition, or -1 if there are any final 2023.1 Antelope stable release
with backports currently in flight that we should wait for. For the
latter case, please propose a final 2023.1 Antelope stable release
patch, and rebase this patch on top of that, with the latest commit
hash of stable/2023.1.

The planned transition deadline was October 30th, 2024 [3] last week,
so please approve this patch as soon as possible if the project is
ready for the transition.

[1] https://docs.openstack.org/project-team-guide/stable-branches.html#unmaintained
[2] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html
[3] https://releases.openstack.org

Change-Id: I2e27c3d0dd39c41223671630fdccd83187c4ea5e

deliverables/antelope/magnum-ui.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/magnum-ui
         hash: 452ca7da23f4489bc0dd25cfd031d4f1db04dfa6
     diff-start: 11.0.0
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/magnum-ui
+        hash: 7bdcf6017fa51859aab015f8db61fcaf4f719fc7
 branches:
   - name: stable/2023.1
     location: 12.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/magnum-ui/2023.1.html

deliverables/antelope/magnum.yaml

@@ -30,7 +30,13 @@ releases:
     projects:
       - repo: openstack/magnum
         hash: 77293ee6c6543a7d058b6d17d7880fc36d665859
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/magnum
+        hash: 77293ee6c6543a7d058b6d17d7880fc36d665859
 branches:
   - name: stable/2023.1
     location: 16.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/magnum/2023.1.html

deliverables/antelope/python-magnumclient.yaml

@@ -11,8 +11,14 @@ releases:
     projects:
       - repo: openstack/python-magnumclient
         hash: de11f40d0c632ff839e5838ed650d1821c87d8a8
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/python-magnumclient
+        hash: d1c547c4c1d4014db3262eba728f448ffb3e01c3
 branches:
   - name: stable/2023.1
     location: 4.1.0
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes:
   https://docs.openstack.org/releasenotes/python-magnumclient/2023.1.html