message: 1) Fix for linter error "Properties of a PATCH request body must not be default-valued. PATCH operation: 'EventSubscriptions_Update' Model Definition: 'EventSubscriptionUpdateParameters' Property: 'eventDeliverySchema'".
  2) Updated the default value of EventDeliverySchema to the correct value used by the service.
diff: "name": "EventDeliverySchema",
  "modelAsString": true
  },
  - "default": "EventGridSchema"
  + "default": "InputEventSchema"
  },
  "retryPolicy": {
  "$ref": "#/definitions/RetryPolicy",
  "x-ms-enum": {
  "name": "EventDeliverySchema",
  "modelAsString": true
  - },
  - "default": "EventGridSchema"
  + }
  },
  "retryPolicy": {
  "$ref": "#/definitions/RetryPolicy",
  