Update to Minecraft 1.21

By: md_5 <git@md-5.net>

paper-server/nms-patches/net/minecraft/world/level/chunk/IChunkAccess.patch

@@ -24,7 +24,7 @@
  
      private static void replaceMissingSections(IRegistry<BiomeBase> iregistry, ChunkSection[] achunksection) {
          for (int i = 0; i < achunksection.length; ++i) {
-@@ -266,10 +275,11 @@
+@@ -270,10 +279,11 @@
  
      public void setUnsaved(boolean flag) {
          this.unsaved = flag;
@@ -36,8 +36,8 @@
 +        return this.unsaved || this.persistentDataContainer.dirty(); // CraftBukkit - SPIGOT-6814: chunk is unsaved if pdc was mutated
      }
  
-     public abstract ChunkStatus getStatus();
-@@ -445,6 +455,27 @@
+     public abstract ChunkStatus getPersistedStatus();
+@@ -449,6 +459,27 @@
          }
      }