Remove unused import

Author: jeffreyAaron

data-prepper-plugins/kafka-plugins/src/main/java/org/opensearch/dataprepper/plugins/kafka/buffer/KafkaBuffer.java

@@ -30,7 +30,6 @@
 import org.opensearch.dataprepper.plugins.kafka.common.serialization.CommonSerializationFactory;
 import org.opensearch.dataprepper.plugins.kafka.common.serialization.SerializationFactory;
 import org.opensearch.dataprepper.plugins.kafka.common.thread.KafkaPluginThreadFactory;
-import org.opensearch.dataprepper.plugins.kafka.configuration.EncryptionType;
 import org.opensearch.dataprepper.plugins.kafka.consumer.KafkaCustomConsumer;
 import org.opensearch.dataprepper.plugins.kafka.consumer.KafkaCustomConsumerFactory;
 import org.opensearch.dataprepper.plugins.kafka.producer.KafkaCustomProducer;