Update maven license plugin configuration

to address deprecation warnings.

Author: marko-bekhta

pom.xml

@@ -145,7 +145,15 @@
                 <artifactId>license-maven-plugin</artifactId>
                 <version>${license-maven-plugin.version}</version>
                 <configuration>
-                    <header>${project.basedir}/src/main/resources/license.header</header>
+                    <licenseSets>
+                        <licenseSet>
+                            <header>${project.basedir}/src/main/resources/license.header</header>
+                            <includes>
+                                <include>**/*.java</include>
+                                <include>**/*.xml</include>
+                            </includes>
+                        </licenseSet>
+                    </licenseSets>
                     <strictCheck>true</strictCheck>
                     <headerDefinitions>
                         <headerDefinition>${project.basedir}/src/main/resources/java-header-style.xml</headerDefinition>
@@ -155,10 +163,6 @@
                         <java>JAVA_CLASS_STYLE</java>
                         <xml>XML_FILE_STYLE</xml>
                     </mapping>
-                    <includes>
-                        <include>**/*.java</include>
-                        <include>**/*.xml</include>
-                    </includes>
                 </configuration>
                 <executions>
                     <execution>