Upgrade Version 8 to 9

SendOptions changes

In NServiceBus version 8 and earlier, the indication that a message was marked for immediate dispatch was provided by SendOptions.RequiredImmediateDispatch(). In version 9, this method has been renamed to SendOptions.IsImmediateDispatchSet().

DataBus interface changes

Starting with NServiceBus version 8, it is mandatory to provide a serializer to the data bus configuration API. This is now enforced in NServiceBus version 9. The BinaryFormatterDataBusSerializer has been removed and SystemJsonDataBusSerializer is the default option that's built-in.