Move from non-LTS JDK 23 to non-LTS JDK 24

Author: jamesfredley

grails-forge/grails-forge-core/src/main/java/org/grails/forge/options/JdkVersion.java

@@ -31,7 +31,9 @@
 public enum JdkVersion {
     JDK_17(17),
     JDK_21(21),
-    JDK_23(23);
+    // 24 is the current non-LTS release and will be replaced by 25 (LTS) in Sep 2025
+    // Spring Framework 6.2.x and Spring Boot 3.5.x will support 25
+    JDK_24(24);
 
     public static final JdkVersion DEFAULT_OPTION = JDK_17;