Un-break for versions <1.21.3 (#2988)

* Use Bukkit Registry API where possible (#2573)

(cherry picked from commit 292dae6)

* compile against 1.21 instead of 1.21.3

* remove method

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

This reverts commit f260e19.

---------

Co-authored-by: Maddy Miller <[email protected]>

Author: SirYwell

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 # Minecraft expectations
-paper = "1.21.3-R0.1-SNAPSHOT"
+paper = "1.21-R0.1-SNAPSHOT"
 fastutil = "8.5.9"
 guava = "31.1-jre"
 log4j = "2.19.0"

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

@@ -376,9 +376,4 @@ public void setStatistic(
         return null;
     }
 
-    @Override
-    public @NotNull PersistentDataContainerView getPersistentDataContainer() {
-        throw new UnsupportedOperationException("Not supported yet.");
-    }
-
 }