Updated ZooKeeper 3.6.3 Release Notes

zookeeper-docs/src/main/resources/markdown/releasenotes.md

@@ -50,6 +50,7 @@ limitations under the License.
 * [ZOOKEEPER-4269](https://issues.apache.org/jira/browse/ZOOKEEPER-4269) - acceptedEpoch.tmp rename failure will cause server startup error
 * [ZOOKEEPER-4272](https://issues.apache.org/jira/browse/ZOOKEEPER-4272) - Upgrade Netty library to > 4.1.60 due to security vulnerability CVE-2021-21295
 * [ZOOKEEPER-4277](https://issues.apache.org/jira/browse/ZOOKEEPER-4277) - dependency-check:check failing - jetty-server-9.4.38 CVE-2021-28165
+* [ZOOKEEPER-4278](https://issues.apache.org/jira/browse/ZOOKEEPER-4278) - dependency-check:check failing - netty-transport-4.1.60.Final CVE-2021-21409
 
 ## Improvement