Tweak version skip range in cat.plugin yml test

rest-api-spec/src/main/resources/rest-api-spec/test/cat.plugins/10_basic.yml

@@ -1,8 +1,8 @@
 ---
 "Help":
   - skip:
-      version: " - 7.99.99"
-      reason: output format changed in 8.0.0
+      version: " - 7.11.99"
+      reason: output format changed in 7.12.0
 
   - do:
       cat.plugins: