Un-break for versions <1.21.3 (#2988)

* Use Bukkit Registry API where possible (#2573)

(cherry picked from commit 292dae65cb01929dc2158f09bdb19fdc82b3669f)

* compile against 1.21 instead of 1.21.3

* remove method

* Revert "Use Bukkit Registry API where possible (#2573)"

This reverts commit f260e19d2976de1ceab9dc7d43a633817723f434.

---------

Co-authored-by: Maddy Miller <mnmiller1@me.com>

worldedit-bukkit/src/test/java/com/sk89q/wepif/TestOfflinePermissible.java

@@ -376,9 +376,4 @@ public class TestOfflinePermissible implements OfflinePlayer, Permissible {
         return null;
     }
 
-    @Override
-    public @NotNull PersistentDataContainerView getPersistentDataContainer() {
-        throw new UnsupportedOperationException("Not supported yet.");
-    }
-
 }