Update to Minecraft 1.21

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

paper-server/nms-patches/net/minecraft/network/NetworkManager.patch

@@ -1,14 +1,14 @@
 --- a/net/minecraft/network/NetworkManager.java
 +++ b/net/minecraft/network/NetworkManager.java
 @@ -114,6 +114,7 @@
-     private volatile IChatBaseComponent delayedDisconnect;
+     private volatile DisconnectionDetails delayedDisconnect;
      @Nullable
      BandwidthDebugMonitor bandwidthDebugMonitor;
 +    public String hostname = ""; // CraftBukkit - add field
  
      public NetworkManager(EnumProtocolDirection enumprotocoldirection) {
          this.receiving = enumprotocoldirection;
-@@ -197,7 +198,7 @@
+@@ -205,7 +206,7 @@
      }
  
      private static <T extends PacketListener> void genericsFtw(Packet<T> packet, PacketListener packetlistener) {
@@ -17,16 +17,16 @@
      }
  
      private void validateListener(ProtocolInfo<?> protocolinfo, PacketListener packetlistener) {
-@@ -457,7 +458,7 @@
+@@ -469,7 +470,7 @@
          }
  
          if (this.isConnected()) {
 -            this.channel.close().awaitUninterruptibly();
 +            this.channel.close(); // We can't wait as this may be called from an event loop.
-             this.disconnectedReason = ichatbasecomponent;
+             this.disconnectionDetails = disconnectiondetails;
          }
  
-@@ -525,7 +526,7 @@
+@@ -537,7 +538,7 @@
      }
  
      public void configurePacketHandler(ChannelPipeline channelpipeline) {