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-API-Patches/Entity-Origin-API.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Entity Origin API
 
 
 diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
-index 236cddb2..015a4c56 100644
+index 19dc1e6a8..69307e252 100644
 --- a/src/main/java/org/bukkit/entity/Entity.java
 +++ b/src/main/java/org/bukkit/entity/Entity.java
 @@ -0,0 +0,0 @@ public interface Entity extends Metadatable, CommandSender, Nameable {
@@ -21,11 +21,12 @@ index 236cddb2..015a4c56 100644
 +     *
 +     * @return Location where entity originates or null if not yet added
 +     */
++    @Nullable
 +    Location getOrigin();
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/entity/FallingBlock.java b/src/main/java/org/bukkit/entity/FallingBlock.java
-index 0cd830d9..170a9aee 100644
+index 64f9d3fd8..14cb0d770 100644
 --- a/src/main/java/org/bukkit/entity/FallingBlock.java
 +++ b/src/main/java/org/bukkit/entity/FallingBlock.java
 @@ -0,0 +0,0 @@ public interface FallingBlock extends Entity {
@@ -45,12 +46,12 @@ index 0cd830d9..170a9aee 100644
 +    }
  }
 diff --git a/src/main/java/org/bukkit/entity/TNTPrimed.java b/src/main/java/org/bukkit/entity/TNTPrimed.java
-index a439eaf5..04cc23ef 100644
+index 5a8789324..3022b4a27 100644
 --- a/src/main/java/org/bukkit/entity/TNTPrimed.java
 +++ b/src/main/java/org/bukkit/entity/TNTPrimed.java
 @@ -0,0 +0,0 @@ public interface TNTPrimed extends Explosive {
-      * @return the source of this primed TNT
       */
+     @Nullable
      public Entity getSource();
 +
 +    /**