[cherry-pick][branch-2.10]Add fix cherry-pick #17856 imported.

pulsar-client/src/main/java/org/apache/pulsar/client/impl/ClientCnx.java

@@ -45,6 +45,7 @@
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
+import lombok.AccessLevel;
 import lombok.Getter;
 import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.apache.commons.lang3.tuple.Pair;