Fix bug in swagger (#31070)

Author: ZhidaLiu

specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2024-10-01-preview/workspaceRP.json

@@ -6517,8 +6517,7 @@
           "type": "array",
           "items": {
             "type": "string"
-          },
-          "readOnly": true
+          }
         },
         "portRanges": {
           "type": "string"