Fixing linting issue (#18781)

Author: krishnasriSomepalli

specification/confluent/resource-manager/Microsoft.Confluent/stable/2021-12-01/confluent.json

@@ -944,10 +944,7 @@
       "in": "query",
       "description": "Client Api Version.",
       "required": true,
-      "type": "string",
-      "enum": [
-        "2021-12-01"
-      ]
+      "type": "string"
     },
     "SubscriptionIdParameter": {
       "in": "path",