Fixes lint error : remove unused import.

Author: chickenchickenlove

spring-kafka/src/test/java/org/springframework/kafka/retrytopic/AsyncCompletableFutureRetryTopicScenarioTests.java

@@ -30,7 +30,6 @@
 import org.apache.kafka.clients.producer.ProducerConfig;
 import org.apache.kafka.common.serialization.StringSerializer;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.condition.DisabledIfEnvironmentVariable;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;