Merge pull request #33087 from vespa-engine/hmusum/change-default-value

Change default value for ZOOKEEPER_SERVER_VERSION to 3.9.3

Author: hakonhall

flags/src/main/java/com/yahoo/vespa/flags/PermanentFlags.java

@@ -185,7 +185,7 @@ public class PermanentFlags {
             HOSTNAME, NODE_TYPE, TENANT_ID, INSTANCE_ID, CLUSTER_TYPE, CLUSTER_ID, VESPA_VERSION);
 
     public static final UnboundStringFlag ZOOKEEPER_SERVER_VERSION = defineStringFlag(
-            "zookeeper-server-version", "3.9.2",
+            "zookeeper-server-version", "3.9.3",
             "ZooKeeper server version, a jar file zookeeper-server-<ZOOKEEPER_SERVER_VERSION>-jar-with-dependencies.jar must exist",
             "Takes effect on restart of Docker container",
             NODE_TYPE, INSTANCE_ID, HOSTNAME);