Updated Upstream (Bukkit/CraftBukkit/Spigot)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Please note that this build includes changes to meet upstreams
requirements for nullability annotations. While we aim for a level of
accuracy, these might not be 100% correct, if there are any issues,
please speak to us on discord, or open an issue on the tracker to
discuss.

Bukkit Changes:
9a6a1de3 Remove nullability annotations from enum constructors
3f0591ea SPIGOT-2540: Add nullability annotations to entire Bukkit API

CraftBukkit Changes:
8d8475fc SPIGOT-4666: Force parameter in HumanEntity#sleep
8b1588e2 Fix ExplosionPrimeEvent#setFire not working with EnderCrystals
39a287b7 Don't ignore newlines in PlayerListHeader/Footer

Spigot Changes:
cf694d87 Add nullability annotations

Spigot-Server-Patches/Handle-Large-Packets-disconnecting-client.patch

@@ -7,7 +7,7 @@ If a players inventory is too big to send in a single packet,
 split the inventory set into multiple packets instead.
 
 diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
-index c5369791..0b8796d0 100644
+index c53697914..0b8796d0a 100644
 --- a/src/main/java/net/minecraft/server/NetworkManager.java
 +++ b/src/main/java/net/minecraft/server/NetworkManager.java
 @@ -0,0 +0,0 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
@@ -27,7 +27,7 @@ index c5369791..0b8796d0 100644
              NetworkManager.g.debug("Skipping packet due to errors", throwable.getCause());
          } else {
 diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
-index 601d4d0f..2d8e6a2f 100644
+index 601d4d0fa..2d8e6a2f4 100644
 --- a/src/main/java/net/minecraft/server/Packet.java
 +++ b/src/main/java/net/minecraft/server/Packet.java
 @@ -0,0 +0,0 @@ public interface Packet<T extends PacketListener> {
@@ -44,7 +44,7 @@ index 601d4d0f..2d8e6a2f 100644
          return false;
      }
 diff --git a/src/main/java/net/minecraft/server/PacketEncoder.java b/src/main/java/net/minecraft/server/PacketEncoder.java
-index 2aa805ee..4f7bc186 100644
+index 2aa805eef..4f7bc186a 100644
 --- a/src/main/java/net/minecraft/server/PacketEncoder.java
 +++ b/src/main/java/net/minecraft/server/PacketEncoder.java
 @@ -0,0 +0,0 @@ public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
@@ -80,7 +80,7 @@ index 2aa805ee..4f7bc186 100644
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
-index 8e35d14f..4a57e8a3 100644
+index 8e35d14f9..4a57e8a3e 100644
 --- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
 +++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
 @@ -0,0 +0,0 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
@@ -93,7 +93,7 @@ index 8e35d14f..4a57e8a3 100644
          } else {
              this.d = new byte[i];
 diff --git a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
-index 706d8438..c0d8f8b4 100644
+index 706d84385..c0d8f8b42 100644
 --- a/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
 +++ b/src/main/java/net/minecraft/server/PacketPlayOutWindowItems.java
 @@ -0,0 +0,0 @@ public class PacketPlayOutWindowItems implements Packet<PacketListenerPlayOut> {