Bump compile output to Java 21

Author: headius

core/pom.rb

@@ -196,8 +196,8 @@
           'verbose' => 'false',
           'showWarnings' => 'true',
           'showDeprecation' => 'true',
-          'source' => [ '${base.java.version}', '17' ],
-          'target' => [ '${base.javac.version}', '17' ],
+          'source' => [ '${base.java.version}', '21' ],
+          'target' => [ '${base.javac.version}', '21' ],
           'useIncrementalCompilation' =>  'false' ) do
     execute_goals( 'compile',
                    :id => 'anno',

core/pom.xml

@@ -518,9 +518,9 @@ DO NOT MODIFY - GENERATED CODE
           <showWarnings>true</showWarnings>
           <showDeprecation>true</showDeprecation>
           <source>${base.java.version}</source>
-          <source>17</source>
+          <source>21</source>
           <target>${base.javac.version}</target>
-          <target>17</target>
+          <target>21</target>
           <useIncrementalCompilation>false</useIncrementalCompilation>
         </configuration>
       </plugin>