[keystone] Transition Yoga to Unmaintained

With the new TC resolution the community replaces Extended Maintenance
with Unmaintained status [1].

So this patch transitions stable/yoga branch to Unmaintained as follows:
- tip of the stable/yoga branch is tagged with yoga-eom tag
- unmaintained/yoga branch will be cut from yoga-eom tag
- stable/yoga branch will be deleted

Some further notes:
- there will no longer be official releases off of yoga branch
- backports can be pushed against unmaintained/yoga branch
- openstack-unmaintained-core and <project>-unmaintained-core groups
  will have the rights to merge patches

For further details please read the resolution [1] & review and +1 this
patch if this is correct as soon as possible.

[1] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html

Change-Id: I527b1a61e729caf7dab41d91253c8f0cde04b56e

deliverables/yoga/keystone.yaml

@@ -19,7 +19,13 @@ releases:
     projects:
       - repo: openstack/keystone
         hash: 7852ca24a4eb86cb271ef7ec5e07f8f9c97f926d
+  - version: yoga-eom
+    projects:
+      - repo: openstack/keystone
+        hash: 0a318bef48bc43b35f9fb1476af466382c0b76f9
 branches:
   - name: stable/yoga
     location: 21.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/keystone/yoga.html

deliverables/yoga/keystoneauth.yaml

@@ -12,7 +12,13 @@ releases:
     projects:
       - repo: openstack/keystoneauth
         hash: 8da0a63569841f82ed73ef1900ed4818bcd0801a
+  - version: yoga-eom
+    projects:
+      - repo: openstack/keystoneauth
+        hash: 063c859847aaee113c67167168fa7f94dd0cab18
 branches:
   - name: stable/yoga
     location: 4.5.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/keystoneauth/yoga.html

deliverables/yoga/keystonemiddleware.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/keystonemiddleware
         hash: 8a05709d69addef5d55262cd6bb179ec741b6f0c
+  - version: yoga-eom
+    projects:
+      - repo: openstack/keystonemiddleware
+        hash: 75631ad31e87bdef5e8c1e150e24d85a31289014
 branches:
   - name: stable/yoga
     location: 9.4.0
-release-notes: https://docs.openstack.org/releasenotes/keystonemiddleware/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/keystonemiddleware/yoga.html

deliverables/yoga/python-keystoneclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-keystoneclient
         hash: 100253d52e0c62dffffddb6f046ad660a9bce1a9
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-keystoneclient
+        hash: 07ddfa8b010da1f1a65e1f00a95020c36c101751
 branches:
   - name: stable/yoga
     location: 4.4.0
-release-notes: https://docs.openstack.org/releasenotes/python-keystoneclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-keystoneclient/yoga.html