[cinder] 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: I24d59f04040380947704b080df9d6a29989c41df

deliverables/antelope/cinder.yaml

@@ -55,7 +55,13 @@ releases:
     projects:
       - repo: openstack/cinder
         hash: 022be6cfb5fddbdd75bbb5d9acc115e9cf6cd868
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/cinder
+        hash: 022be6cfb5fddbdd75bbb5d9acc115e9cf6cd868
 branches:
   - name: stable/2023.1
     location: 22.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/cinder/2023.1.html

deliverables/antelope/cinderlib.yaml

@@ -10,7 +10,13 @@ releases:
     projects:
       - repo: openstack/cinderlib
         hash: 18c81f0023ff378427dff49b188a14b999c341cf
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/cinderlib
+        hash: 493fd58f1c7dd1ccd20bf727adc00ef7f2155a76
 branches:
   - name: stable/2023.1
     location: 5.1.0
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/cinderlib/2023.1.html

deliverables/antelope/os-brick.yaml

@@ -31,7 +31,13 @@ releases:
     projects:
       - repo: openstack/os-brick
         hash: 7ad0ed6e5be4443cf2578ff073f01966729275d4
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/os-brick
+        hash: 7ad0ed6e5be4443cf2578ff073f01966729275d4
 branches:
   - name: stable/2023.1
     location: 6.2.0
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/os-brick/2023.1.html

deliverables/antelope/python-brick-cinderclient-ext.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-brick-cinderclient-ext
         hash: 273bdf22d4c94141b7dab80b50dd7af9a637d7a3
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/python-brick-cinderclient-ext
+        hash: a5f36a065bf8ae33e255e9ba5cb1177dbb513113
 branches:
   - name: stable/2023.1
     location: 2.1.0
-release-notes: https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/2023.1.html
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/2023.1.html

deliverables/antelope/python-cinderclient.yaml

@@ -15,7 +15,14 @@ releases:
     projects:
       - repo: openstack/python-cinderclient
         hash: f7a612ef3edf1158cac8829af97ed64920720b6a
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/python-cinderclient
+        hash: 84ca7a01cef5d70f96d9a6934d8398e6babd69a6
 branches:
   - name: stable/2023.1
     location: 9.3.0
-release-notes: https://docs.openstack.org/releasenotes/python-cinderclient/2023.1.html
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-cinderclient/2023.1.html