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/0031-Add-MetadataStoreBase.removeAll-Plugin.patch

@@ -1,4 +1,4 @@
-From 28cef08075786587ecc702ad3dab4bc06d3ce624 Mon Sep 17 00:00:00 2001
+From 0ae676c5ab5d5819d3e94e9ec554162a34fffa28 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Tue, 16 Jul 2013 21:26:50 -0400
 Subject: [PATCH] Add MetadataStoreBase.removeAll(Plugin)
@@ -6,10 +6,10 @@ Subject: [PATCH] Add MetadataStoreBase.removeAll(Plugin)
 So that on reload, metadata will be cleared
 
 diff --git a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
-index 64c0f0a7..6da6abd8 100644
+index 32728628e..b634b124e 100644
 --- a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
 +++ b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
-@@ -124,6 +124,26 @@ public abstract class MetadataStoreBase<T> {
+@@ -126,6 +126,26 @@ public abstract class MetadataStoreBase<T> {
          }
      }
  
@@ -20,7 +20,7 @@ index 64c0f0a7..6da6abd8 100644
 +     * @param owningPlugin the plugin requesting the invalidation.
 +     * @throws IllegalArgumentException If plugin is null
 +     */
-+    public void removeAll(Plugin owningPlugin) {
++    public void removeAll(@NotNull Plugin owningPlugin) {
 +        Validate.notNull(owningPlugin, "Plugin cannot be null");
 +        for (Iterator<Map<Plugin, MetadataValue>> iterator = metadataMap.values().iterator(); iterator.hasNext(); ) {
 +            Map<Plugin, MetadataValue> values = iterator.next();
@@ -37,5 +37,5 @@ index 64c0f0a7..6da6abd8 100644
       * Creates a unique name for the object receiving metadata by combining
       * unique data from the subject with a metadataKey.
 -- 
-2.20.1
+2.21.0