chore: migrating from Java 17 to 21

Author: FanJups

pom.xml

@@ -28,7 +28,7 @@
     <url>https://github.com/osscameroon/js-generator</url>
 
     <properties>
-        <java.version>17</java.version>
+        <java.version>21</java.version>
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>