SpringBoot Use MappingJackson2MessageConverter(ObjectMapper) in WebSocketMessagingAutoConfiguration

This PR changes to use the new MappingJackson2MessageConverter(ObjectMapper) constructor in WebSocketMessagingAutoConfiguration.configureMessageConverters().

See https://github.com/spring-projects/spring-framework/pull/31234

Comment From: wilkinsona

Thanks once again, @izeye.