Polish "Remove RabbitMQ AutoConfig Boolean Coercion"

See gh-23799

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/amqp/RabbitAutoConfigurationTests.java

@@ -33,7 +33,6 @@
 import com.rabbitmq.client.impl.DefaultCredentialsProvider;
 import org.aopalliance.aop.Advice;
 import org.junit.jupiter.api.Test;
-import org.mockito.Mockito;
 
 import org.springframework.amqp.core.AcknowledgeMode;
 import org.springframework.amqp.core.AmqpAdmin;