Update commons-net to version 3.9.0 (#646)

Author: sgrampone

java/pom.xml

@@ -88,7 +88,7 @@
 		<dependency>
 			<groupId>commons-net</groupId>
 			<artifactId>commons-net</artifactId>
-			<version>3.3</version>
+			<version>3.9.0</version>
 		</dependency>
 		<dependency>
 			<groupId>javax.transaction</groupId>