Updated Upstream (Bukkit/CraftBukkit) (#7604)

Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
33a2b476 PR-734: Make PlayerInventory#getItem Nullable

CraftBukkit Changes:
953d3ddc SPIGOT-3034: PlayerKickEvent.setLeaveMessage(String) doesn't actually do anything
2c47af0c SPIGOT-6963: CraftMetaBlockState#getBlockState applied TileEntity ids without the minecraft namespace prefix.

patches/api/0054-Fix-upstream-javadocs.patch

@@ -76,7 +76,7 @@ index be9334a8b5fba9181ad63c211697e798be63da25..0514a141cb93a650be38c63d4336d46e
       * Instructs this Mob to set the specified LivingEntity as its target.
       * <p>
 diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
-index a0777f9dc7cb6d4274635d794cf66de714535cde..2ba2c61dd1e8180d9dfbced8dc1642c75aaff6f7 100644
+index 2a4cbda6cf881b850c293e54c142c3fe7a5165bd..9eb3903ec290cb43f129f44c6ef0cd99b5769b5f 100644
 --- a/src/main/java/org/bukkit/entity/Player.java
 +++ b/src/main/java/org/bukkit/entity/Player.java
 @@ -753,7 +753,7 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
@@ -122,16 +122,3 @@ index 1b2267f4e8ebded198773ec80e2bff2c861c7084..1a58734d919fae247eeb85dd785fd599
      public Location getTo() {
          return to;
      }
-diff --git a/src/main/java/org/bukkit/inventory/PlayerInventory.java b/src/main/java/org/bukkit/inventory/PlayerInventory.java
-index 99d900b2394b6c210ccf845768dae72864f32270..515587a958041e94f03c48ae87812abc39e1791c 100644
---- a/src/main/java/org/bukkit/inventory/PlayerInventory.java
-+++ b/src/main/java/org/bukkit/inventory/PlayerInventory.java
-@@ -106,7 +106,7 @@ public interface PlayerInventory extends Inventory {
-      *
-      * @return the ItemStack in the given slot
-      */
--    @NotNull
-+    @Nullable
-     public ItemStack getItem(@NotNull EquipmentSlot slot);
- 
-     /**