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/server/0609-fix-PlayerItemHeldEvent-firing-twice.patch

@@ -0,0 +1,18 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: chickeneer <emcchickeneer@gmail.com>
+Date: Thu, 22 Apr 2021 19:02:07 -0700
+Subject: [PATCH] fix PlayerItemHeldEvent firing twice
+
+
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 63649e0d5547d1b904a6605868dfad52214c7b3c..917aa2bd63db9a63c75267564d0c3602b0f01392 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -2054,6 +2054,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
+         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel());
+         if (this.player.isImmobile()) return; // CraftBukkit
+         if (packet.getSlot() >= 0 && packet.getSlot() < Inventory.getSelectionSize()) {
++            if (packet.getSlot() == this.player.getInventory().selected) { return; } // Paper - don't fire itemheldevent when there wasn't a slot change
+             PlayerItemHeldEvent event = new PlayerItemHeldEvent(this.getCraftPlayer(), this.player.getInventory().selected, packet.getSlot());
+             this.cserver.getPluginManager().callEvent(event);
+             if (event.isCancelled()) {