GH-381: Remove duplicated SCSt-binder-test dep
GH-381: Remove duplicated SCSt-binder-test dep

Fixes spring-cloud/spring-cloud-stream-binder-kafka#381
spring-cloud/spring-cloud-stream,garyrussell/spring-cloud-stream,garyrussell/spring-cloud-stream,spring-cloud/spring-cloud-stream,garyrussell/spring-cloud-stream,spring-cloud/spring-cloud-stream