feat: Update OpenAPI file replicated from CMS4

Author: github-actions

openapi/openapi.yaml

@@ -755,6 +755,7 @@ info:
     quantityDiscount:update | Quantity discount change event | ID of quantity discount
     quantityDiscount:delete | Quantity discount deleting event | ID of quantity discount
     salesChannel:create | Sales channel create event | GUID of sales channel
+    salesChannel:update | Sales channel update event | GUID of sales channel
     shippingMethod:change | Shipping method change event | Shipping method GUID
     shippingRequest:cancelled | Shipping request was not chosen for order delivery | `shippingRequestCode` associated with the cart
     shippingRequest:confirmed | Shipping request was chosen for order delivery | `shippingRequestCode` associated with the cart