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/Expose-server-CommandMap.patch

@@ -5,29 +5,31 @@ Subject: [PATCH] Expose server CommandMap
 
 
 diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
-index 6055c801..cb7dc068 100644
+index 2ad9a7d7f..3a80f2e29 100644
 --- a/src/main/java/org/bukkit/Bukkit.java
 +++ b/src/main/java/org/bukkit/Bukkit.java
 @@ -0,0 +0,0 @@ public final class Bukkit {
          return server.getUnsafe();
      }
  
++
 +    // Paper start
 +    /**
 +     * Gets the active {@link org.bukkit.command.CommandMap}
 +     *
 +     * @return the active command map
 +     */
++    @NotNull
 +    public static org.bukkit.command.CommandMap getCommandMap() {
 +        return server.getCommandMap();
 +    }
 +    // Paper end
 +
+     @NotNull
      public static Server.Spigot spigot()
      {
-         return server.spigot();
 diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
-index 1632af18..c4dc1de2 100644
+index 3ad70b92f..4c3156071 100644
 --- a/src/main/java/org/bukkit/Server.java
 +++ b/src/main/java/org/bukkit/Server.java
 @@ -0,0 +0,0 @@ public interface Server extends PluginMessageRecipient {
@@ -40,6 +42,7 @@ index 1632af18..c4dc1de2 100644
 +     *
 +     * @return the active command map
 +     */
++    @NotNull
 +    org.bukkit.command.CommandMap getCommandMap();
 +
      /**