[keystone] Transition Zed to Unmaintained

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

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

Note:
- there will no longer be official releases off of zed branch after this
  transition
- backports can be pushed to unmaintained/yoga 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 Zed stable release with
backports currently in flight that we should wait for. For the latter
case, please propose a final Zed stable release patch, and rebase this
patch on top of that, with the latest commit hash of stable/zed.

The transition deadline is May 2nd, 2024. [3]

[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: I20e705b79388895b0bcc4b540ff6e8004ea68b0b

deliverables/zed/keystone.yaml

@@ -23,9 +23,15 @@ releases:
     projects:
       - repo: openstack/keystone
         hash: 72a4fc0f3ccf7a5ca9fc40e5364e14f881ec27b2
+  - version: zed-eom
+    projects:
+      - repo: openstack/keystone
+        hash: f63062d47712406a807ce07b4ff3ec6213b0e824
 branches:
   - name: stable/zed
     location: 22.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 cycle-highlights:
   - Implemented `OAuth 2.0 credentials grant
     <https://specs.openstack.org/openstack/keystone-specs/specs/keystone/yoga/oauth2-client-credentials-ext.html>`_

deliverables/zed/keystoneauth.yaml

@@ -20,7 +20,13 @@ releases:
     projects:
       - repo: openstack/keystoneauth
         hash: 61c3dc7b38d53d6558b479db4ffbfbd1038994c9
+  - version: zed-eom
+    projects:
+      - repo: openstack/keystoneauth
+        hash: 61c3dc7b38d53d6558b479db4ffbfbd1038994c9
 branches:
   - name: stable/zed
     location: 5.0.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/keystoneauth/zed.html

deliverables/zed/keystonemiddleware.yaml

@@ -27,8 +27,14 @@ releases:
     projects:
       - repo: openstack/keystonemiddleware
         hash: b61d3125f270b1c3da17cacb443034e1e9a8ce50
+  - version: zed-eom
+    projects:
+      - repo: openstack/keystonemiddleware
+        hash: b61d3125f270b1c3da17cacb443034e1e9a8ce50
 branches:
   - name: stable/zed
     location: 10.1.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes:
   https://docs.openstack.org/releasenotes/keystonemiddleware/zed.html

deliverables/zed/python-keystoneclient.yaml

@@ -19,7 +19,14 @@ releases:
     projects:
       - repo: openstack/python-keystoneclient
         hash: bc8e9e73b1ecbcf9cae8c5bfe013c68469b60cef
+  - version: zed-eom
+    projects:
+      - repo: openstack/python-keystoneclient
+        hash: aab26ecf880b901f759791e84cfc20ed4d2bb791
 branches:
   - name: stable/zed
     location: 5.0.1
-release-notes: https://docs.openstack.org/releasenotes/python-keystoneclient/zed.html
+  - name: unmaintained/zed
+    location: zed-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-keystoneclient/zed.html