[heat] 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: I1e10b8918a80ed1b1a7a4a4398022d368dba2268

deliverables/antelope/heat-agents.yaml

@@ -16,7 +16,13 @@ releases:
       - repo: openstack/heat-agents
         hash: e5d2863982f92c6fa3e326832735ecfd7672d824
     diff-start: 5.0.0
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/heat-agents
+        hash: a0142af37c758441430c243a626612632232f4f5
 branches:
   - name: stable/2023.1
     location: 6.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/heat-agents/2023.1.html

deliverables/antelope/heat-dashboard.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/heat-dashboard
         hash: fa9efec740b54cf05f6607098a4fbf13e5e58f8b
     diff-start: 8.0.0
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/heat-dashboard
+        hash: 007a7a5a3b338543dd6e3badd04967324e8f0e9b
 branches:
   - name: stable/2023.1
     location: 9.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/heat-dashboard/2023.1.html

deliverables/antelope/heat.yaml

@@ -25,7 +25,13 @@ releases:
     projects:
       - repo: openstack/heat
         hash: 91709d22020c8cdba8fab19a00854e65bde90887
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/heat
+        hash: 81a8b93254842150db98b5fc1388188d67e223f0
 branches:
   - name: stable/2023.1
     location: 20.0.0.0rc1
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
 release-notes: https://docs.openstack.org/releasenotes/heat/2023.1.html

deliverables/antelope/python-heatclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-heatclient
         hash: 712739e5e7322f270467bbf49d5062a241db98dd
+  - version: 2023.1-eom
+    projects:
+      - repo: openstack/python-heatclient
+        hash: 14ef7118f7684ad6d48c2a83d7d9151103a8f96f
 branches:
   - name: stable/2023.1
     location: 3.2.0
-release-notes: https://docs.openstack.org/releasenotes/python-heatclient/2023.1.html
+  - name: unmaintained/2023.1
+    location: 2023.1-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-heatclient/2023.1.html