[swift] 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: I7a793845ad18d31d38c5a5ecc72e29b289738484

deliverables/yoga/python-swiftclient.yaml

@@ -15,7 +15,14 @@ releases:
     projects:
       - repo: openstack/python-swiftclient
         hash: 4989d94663b59eac34b7cd5dfaa7e673fc73e862
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-swiftclient
+        hash: 3b0c49c592b137d669f709acf8504db103523580
 branches:
   - name: stable/yoga
     location: 3.13.1
-release-notes: https://docs.openstack.org/releasenotes/python-swiftclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-swiftclient/yoga.html

deliverables/yoga/swift.yaml

@@ -18,7 +18,13 @@ releases:
     projects:
       - repo: openstack/swift
         hash: 19879831272b37b5e49f73a4d49f1a4587ccd7c7
+  - version: yoga-eom
+    projects:
+      - repo: openstack/swift
+        hash: 2a73f12a4500eabcd0dcdea39ae5ae73a0c3fe4f
 branches:
   - name: stable/yoga
     location: 2.29.1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/swift/yoga.html