Use new datetime property

Author: ryanjbaxter

spring-cloud-bus-tests/src/test/java/org/springframework/cloud/bus/jackson/BusJacksonIntegrationTests.java

@@ -48,7 +48,7 @@
 import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
 import static tools.jackson.databind.cfg.DateTimeFeature.WRITE_DATES_AS_TIMESTAMPS;
 
-@SpringBootTest(properties = "spring.jackson.datetime.write-dates-as-timestamps=true", webEnvironment = RANDOM_PORT)
+@SpringBootTest(properties = "spring.jackson.datatype.datetime.write-dates-as-timestamps=true", webEnvironment = RANDOM_PORT)
 @DirtiesContext
 public class BusJacksonIntegrationTests {