fix ci

Author: coderzc

tests/src/test/java/io/streamnative/pulsar/handlers/mqtt/base/MessageConverTest.java

@@ -27,7 +27,7 @@
 import org.apache.pulsar.broker.service.Topic;
 import org.apache.pulsar.client.impl.MessageImpl;
 import org.apache.pulsar.common.naming.TopicDomain;
-import org.junit.Assert;
+import org.testng.Assert;
 import org.testng.annotations.BeforeClass;
 import org.testng.annotations.Test;