Update status of RDO releases

- Zed Cloudsig is not longer supported as it is now in unmaintained
  mode.
- RDO Trunk Wallaby and Xena are now stopped for CS9 too.

Change-Id: I5cf0c870c246e208477776698f4b85f70c18c07c

docs/deliverables/release-cadence.md

@@ -26,7 +26,6 @@ Current maintained CloudSIG releases are:
 | CentOS Stream 9  | Caracal   | supported |
 | CentOS Stream 9  | Bobcat   | supported |
 | CentOS Stream 9  | Antelope | supported |
-| CentOS Stream 9  | Zed      | unmaintained |
 
 
 
@@ -43,8 +42,6 @@ Currently, RDO maintains following RDO Trunk repositories:
 | CentOS Stream 9  | Antelope | supported |
 | CentOS Stream 9  | Zed      | unmaintained |
 | CentOS Stream 9  | Yoga     | unmaintained|
-| CentOS Stream 9  | Xena     | unmaintained|
-| CentOS Stream 9  | Wallaby  | unmaintained |
 
 
 ### RHEL compatibility