Remove unused import in IntObservZipkinTests

Author: artembilan

spring-integration-core/src/test/java/org/springframework/integration/support/management/observation/IntegrationObservabilityZipkinTests.java

@@ -24,7 +24,6 @@
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.integration.annotation.BridgeTo;
 import org.springframework.integration.annotation.EndpointId;
 import org.springframework.integration.annotation.Poller;
 import org.springframework.integration.annotation.ServiceActivator;