Test version update for must_exist test (#65216)

Relates #65141

Author: henningandersen

rest-api-spec/src/main/resources/rest-api-spec/test/indices.update_aliases/40_must_exist.yml

@@ -2,7 +2,7 @@
 "Remove alias with must_exist":
 
   - skip:
-      version: " - 7.99.99" # TODO: 7.10.99
+      version: " - 7.10.99"
       reason: "must_exist does not work until 7.11"
 
   - do: