Use Java 11

Author: rbygrave

graalvm-feature/pom.xml

@@ -14,7 +14,7 @@
   <version>0.1</version>
 
   <properties>
-    <maven.compiler.release>21</maven.compiler.release>
+    <maven.compiler.release>11</maven.compiler.release>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>