Updated Upstream (Bukkit/CraftBukkit) (#8430)

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:
09943450 Update SnakeYAML version
5515734f SPIGOT-7162: Incorrect description for Entity#getVehicle javadoc
6f82b381 PR-788: Add getHand() to all relevant events

CraftBukkit Changes:
aaf484f6f SPIGOT-7163: CraftMerchantRecipe doesn't copy demand and specialPrice from BukkitMerchantRecipe
5329dd6fd PR-1107: Add getHand() to all relevant events
93061706e SPIGOT-7045: Ocelots never spawn with babies with spawn reason OCELOT_BABY

patches/api/0266-Allow-adding-items-to-BlockDropItemEvent.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: BillyGalbreath <blake.galbreath@gmail.com>
+Date: Wed, 20 Jan 2021 14:25:26 -0600
+Subject: [PATCH] Allow adding items to BlockDropItemEvent
+
+
+diff --git a/src/main/java/org/bukkit/event/block/BlockDropItemEvent.java b/src/main/java/org/bukkit/event/block/BlockDropItemEvent.java
+index a0f6f1af304190b4c5db4b284d460f625eeb7801..3dd4bd38e72c04e74e5787fb38ca9abd10bad06b 100644
+--- a/src/main/java/org/bukkit/event/block/BlockDropItemEvent.java
++++ b/src/main/java/org/bukkit/event/block/BlockDropItemEvent.java
+@@ -64,7 +64,7 @@ public class BlockDropItemEvent extends BlockEvent implements Cancellable {
+      * Gets list of the Item drops caused by the block break.
+      *
+      * This list is mutable - removing an item from it will cause it to not
+-     * drop. It is not legal however to add new items to the list.
++     * drop. Adding to the list is allowed.
+      *
+      * @return The Item the block caused to drop
+      */