Upgrade Javassist 3.21

Author: slandelle

client/pom.xml

@@ -57,7 +57,7 @@
 		<dependency>
 			<groupId>org.javassist</groupId>
 			<artifactId>javassist</artifactId>
-			<version>3.20.0-GA</version>
+			<version>3.21.0-GA</version>
 		</dependency>
 	</dependencies>
 </project>