Move to selecting latest Rocky Linux

Moving to select latest version until logic can be added
for selecting specific version. Non latest versions are stored in
a different archive repo.

roles/netbootxyz/defaults/main.yml

@@ -438,20 +438,10 @@ releases:
     mirror: http://download.rockylinux.org
     name: Rocky Linux
     versions:
-    - code_name: 9.2
-      name: 9.2
-    - code_name: 9.1
-      name: 9.1
-    - code_name: 9.0
-      name: 9.0
-    - code_name: 8.7
-      name: 8.7
-    - code_name: 8.6
-      name: 8.6
-    - code_name: 8.5
-      name: 8.5
-    - code_name: 8.4
-      name: 8.4
+    - code_name: 9
+      name: 9 (Latest)
+    - code_name: 8
+      name: 8 (Latest)
   scientific:
     base_dir: linux/scientific
     enabled: true