Move some approvers to emeritus status (#6966)

OWNERS

@@ -4,3 +4,5 @@ approvers:
   - kubespray-approvers
 reviewers:
   - kubespray-reviewers
+emeritus_approvers:
+  - kubespray-emeritus_approvers
\ No newline at end of file

OWNERS_ALIASES

 aliases:
   kubespray-approvers:
-    - ant31
     - mattymo
-    - atoms
     - chadswen
     - mirwan
     - miouge1
-    - riverzhang
-    - verwilst
     - woopstar
     - luckysb
     - floryut
   kubespray-reviewers:
-    - jjungnickel
-    - archifleks
     - holmsten
     - bozzo
     - eppo
     - oomichi
+  kubespray-emeritus_approvers:
+    - riverzhang
+    - atoms
+    - ant31