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/0281-add-get-set-drop-chance-to-EntityEquipment.patch

@@ -0,0 +1,43 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Thu, 22 Apr 2021 00:28:20 -0700
+Subject: [PATCH] add get-set drop chance to EntityEquipment
+
+
+diff --git a/src/main/java/org/bukkit/inventory/EntityEquipment.java b/src/main/java/org/bukkit/inventory/EntityEquipment.java
+index 42f76751ec414648ee719c341d471d947bf85be6..58d52f6e1660ebdb098566a2ae6b50c8b44dc0d9 100644
+--- a/src/main/java/org/bukkit/inventory/EntityEquipment.java
++++ b/src/main/java/org/bukkit/inventory/EntityEquipment.java
+@@ -513,4 +513,32 @@ public interface EntityEquipment {
+      */
+     @NotNull // Paper
+     Entity getHolder();
++    // Paper start
++    /**
++     * Gets the drop chance of specified slot.
++     *
++     * <ul>
++     * <li>A drop chance of 0.0F will never drop
++     * <li>A drop chance of 1.0F will always drop
++     * </ul>
++     *
++     * @param slot the slot to get the drop chance of
++     * @return the drop chance for the slot
++     */
++    float getDropChance(@NotNull EquipmentSlot slot);
++
++    /**
++     * Sets the drop chance of the specified slot.
++     *
++     * <ul>
++     * <li>A drop chance of 0.0F will never drop
++     * <li>A drop chance of 1.0F will always drop
++     * </ul>
++     *
++     * @param slot the slot to set the drop chance of
++     * @param chance the drop chance for the slot
++     * @throws UnsupportedOperationException when called on non-{@link Mob} entities
++     */
++    void setDropChance(@NotNull EquipmentSlot slot, float chance);
++    // Paper end
+ }