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/0038-Misc-Utils.patch

@@ -1,4 +1,4 @@
-From 3fabac75e83331f5b4ac0cefaa42b16441a2956e Mon Sep 17 00:00:00 2001
+From a3d13870daf8d1b11309cbbf8947ae5324aed6b5 Mon Sep 17 00:00:00 2001
 From: vemacs <d@nkmem.es>
 Date: Wed, 23 Nov 2016 12:53:43 -0500
 Subject: [PATCH] Misc Utils
@@ -6,20 +6,22 @@ Subject: [PATCH] Misc Utils
 
 diff --git a/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java b/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java
 new file mode 100644
-index 00000000..d60ecbb1
+index 000000000..5bb677ce5
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java
-@@ -0,0 +1,31 @@
+@@ -0,0 +1,34 @@
 +package com.destroystokyo.paper.utils;
 +
 +import java.util.concurrent.ConcurrentLinkedQueue;
 +import java.util.concurrent.atomic.LongAdder;
++import org.jetbrains.annotations.NotNull;
++import org.jetbrains.annotations.Nullable;
 +
 +public class CachedSizeConcurrentLinkedQueue<E> extends ConcurrentLinkedQueue<E> {
 +    private final LongAdder cachedSize = new LongAdder();
 +
 +    @Override
-+    public boolean add(E e) {
++    public boolean add(@NotNull E e) {
 +        boolean result = super.add(e);
 +        if (result) {
 +            cachedSize.increment();
@@ -27,6 +29,7 @@ index 00000000..d60ecbb1
 +        return result;
 +    }
 +
++    @Nullable
 +    @Override
 +    public E poll() {
 +        E result = super.poll();
@@ -42,5 +45,5 @@ index 00000000..d60ecbb1
 +    }
 +}
 -- 
-2.20.1
+2.21.0