fix cherry-pick: remove unwanted imports

Author: priyanshu-ctds

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java

@@ -23,7 +23,6 @@
 import com.google.common.annotations.VisibleForTesting;
 import io.netty.buffer.ByteBuf;
 import java.util.Iterator;
-import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 import java.util.concurrent.CompletableFuture;
@@ -36,7 +35,6 @@
 import org.apache.bookkeeper.mledger.ManagedLedgerException;
 import org.apache.bookkeeper.mledger.ManagedLedgerReplayTask;
 import org.apache.bookkeeper.mledger.Position;
-import org.apache.commons.lang3.StringUtils;
 import org.apache.pulsar.broker.PulsarService;
 import org.apache.pulsar.broker.service.Topic.PublishContext;
 import org.apache.pulsar.common.api.proto.MessageMetadata;