Prevent out of world claims

Author: SirYwell

Core/src/main/java/com/plotsquared/core/plot/Plot.java

@@ -2182,6 +2182,9 @@ public BlockLoc getPosition() {
      * @return if the given player can claim the plot
      */
     public boolean canClaim(@NonNull PlotPlayer<?> player) {
+        if (!WorldUtil.isValidLocation(getBottomAbs())) {
+            return false;
+        }
         PlotCluster cluster = this.getCluster();
         if (cluster != null) {
             if (!cluster.isAdded(player.getUUID()) && !player.hasPermission("plots.admin.command.claim")) {

build.gradle.kts

@@ -85,7 +85,7 @@ subprojects {
 
     plugins.withId("java") {
         the<JavaPluginExtension>().toolchain {
-            languageVersion.set(JavaLanguageVersion.of(17))
+            languageVersion.set(JavaLanguageVersion.of(21))
         }
     }