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/Mob-Pathfinding-API.patch

@@ -7,7 +7,7 @@ Implements Pathfinding API for mobs
 
 diff --git a/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java b/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java
 new file mode 100644
-index 00000000..ed3d86dd
+index 000000000..ed3d86ddd
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java
 @@ -0,0 +0,0 @@
@@ -125,7 +125,7 @@ index 00000000..ed3d86dd
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
-index c55aadb5..cac0ce2a 100644
+index c55aadb53..cac0ce2a3 100644
 --- a/src/main/java/net/minecraft/server/NavigationAbstract.java
 +++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
 @@ -0,0 +0,0 @@ public abstract class NavigationAbstract {
@@ -173,7 +173,7 @@ index c55aadb5..cac0ce2a 100644
          this.pathfindFailures = 0; this.lastFailure = 0; // Paper - Pathfinding optimizations
          this.c = null;
 diff --git a/src/main/java/net/minecraft/server/PathEntity.java b/src/main/java/net/minecraft/server/PathEntity.java
-index 31fc1fbc..5cf7f3bf 100644
+index 31fc1fbc6..5cf7f3bf1 100644
 --- a/src/main/java/net/minecraft/server/PathEntity.java
 +++ b/src/main/java/net/minecraft/server/PathEntity.java
 @@ -0,0 +0,0 @@ import javax.annotation.Nullable;
@@ -212,7 +212,7 @@ index 31fc1fbc..5cf7f3bf 100644
  
          return new Vec3D((double) pathpoint.a, (double) pathpoint.b, (double) pathpoint.c);
 diff --git a/src/main/java/net/minecraft/server/PathPoint.java b/src/main/java/net/minecraft/server/PathPoint.java
-index 78ed0028..0dd6e46d 100644
+index 78ed00286..0dd6e46d1 100644
 --- a/src/main/java/net/minecraft/server/PathPoint.java
 +++ b/src/main/java/net/minecraft/server/PathPoint.java
 @@ -0,0 +0,0 @@ package net.minecraft.server;
@@ -229,7 +229,7 @@ index 78ed0028..0dd6e46d 100644
      public int d = -1;
      public float e;
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
-index 5bf1cd06..53c2d154 100644
+index 5bf1cd06f..53c2d154e 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
 @@ -0,0 +0,0 @@ import org.bukkit.loot.LootTable;