fix: support Paper 26.x unversioned craftbukkit package

Paper 26.x removed the version suffix from the craftbukkit package.
Check IS_PAPER first and try without version prefix, then fall back
to the versioned package for older/non-Paper servers.

Fixes #196

Author: charlyg31

src/main/java/com/extendedclip/deluxemenus/utils/VersionHelper.java

@@ -217,6 +217,11 @@ public static Class<?> getNMSClass(final String pkg, final String className) thr
      * @return The craft class.
      */
     public static Class<?> getCraftClass(@NotNull final String name) throws ClassNotFoundException {
+        if (IS_PAPER) {
+            try {
+                return Class.forName("org.bukkit.craftbukkit." + name);
+            } catch (ClassNotFoundException ignored) { }
+        }
         return Class.forName("org.bukkit.craftbukkit." + NMS_VERSION + "." + name);
     }