Update parser to Java 21

This will primarily be used with JRuby 10+, which requires Java 21.

Author: headius

pom.xml

@@ -14,8 +14,8 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <chicory.version>1.2.1</chicory.version>
     <junit.version>5.12.1</junit.version>
-    <maven.compiler.source>17</maven.compiler.source>
-    <maven.compiler.target>17</maven.compiler.target>    
+    <maven.compiler.source>21</maven.compiler.source>
+    <maven.compiler.target>21</maven.compiler.target>
   </properties>
 
   <parent>