Upgrade to format 3

Author: Theosakamg

rcljava_utils/package.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
-<?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 
-<package format="2">
+<package format="3">
   <name>rcljava_utils</name>
   <version>0.0.2</version>
   <description>This package is ROS2 utility.</description>