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/0679-Optimize-entity-tracker-passenger-checks.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Andrew Steinborn <git@steinborn.me>
+Date: Sun, 8 Aug 2021 00:52:54 -0400
+Subject: [PATCH] Optimize entity tracker passenger checks
+
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
+index ddc5b4849939a96b76611cfa1cd34c06c7acc0f8..5246d427973f34843046e59c198785c73fccec33 100644
+--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
++++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
+@@ -71,7 +71,7 @@ public class ServerEntity {
+         this.trackedPlayers = trackedPlayers;
+         // CraftBukkit end
+         this.ap = Vec3.ZERO;
+-        this.lastPassengers = Collections.emptyList();
++        this.lastPassengers = com.google.common.collect.ImmutableList.of(); // Paper - optimize passenger checks
+         this.level = worldserver;
+         this.broadcast = consumer;
+         this.entity = entity;