ZOOKEEPER-4278: dependency-check:check failing - netty-transport-4.1.60.Final CVE-2021-21409

Upgraded Netty library to 4.1.63.Final

Author: Ayush Mantri <aayushmantri@gmail.com>

Reviewers: Mohammad Arshad <arshad@apache.org>

Closes #1678 from ayushmantri/ZOOKEEPER-4278

(cherry picked from commit 925b5b28a0aa9e7749da9672de92eab5b95578f0)
Signed-off-by: Mohammad Arshad <arshad@apache.org>

pom.xml

@@ -355,7 +355,7 @@
     <mockito.version>2.27.0</mockito.version>
     <hamcrest.version>1.3</hamcrest.version>
     <commons-cli.version>1.2</commons-cli.version>
-    <netty.version>4.1.60.Final</netty.version>
+    <netty.version>4.1.63.Final</netty.version>
     <jetty.version>9.4.39.v20210325</jetty.version>
     <jackson.version>2.10.5.1</jackson.version>
     <json.version>1.1.1</json.version>