Reinstate RSocket codecs configuration ordering
Since spring-projects/spring-framework#23314 and the following commit
spring-projects/spring-framework@be4facef1b, the RSocket codec selection
is relaxed and the order of configured commits matters again.
This commit ensures that the CBOR codec is configured ahead of the JSON
codec so that it can be chosen first if no data mime type is specified
when a connection is established with a client requester.