Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appears 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:
b999860d SPIGOT-2304: Add LootGenerateEvent

CraftBukkit Changes:
77fd87e4 SPIGOT-2304: Implement LootGenerateEvent
a1a705ee SPIGOT-5566: Doused campfires & fires should call EntityChangeBlockEvent
41712edd SPIGOT-5707: PersistentDataHolder not Persistent on API dropped Item

Spigot-API-Patches/0183-Add-BlockSoundGroup-interface.patch

@@ -1,4 +1,4 @@
-From 5b993133be600a04fc846882400213a82bec3f84 Mon Sep 17 00:00:00 2001
+From 28e560344d9b9e4904d6fbce0f7dcd658d445220 Mon Sep 17 00:00:00 2001
 From: simpleauthority <jacob@algorithmjunkie.com>
 Date: Tue, 28 May 2019 03:41:28 -0700
 Subject: [PATCH] Add BlockSoundGroup interface
@@ -93,5 +93,5 @@ index 41f6b8491..971386795 100644
 +    // Paper end
  }
 -- 
-2.25.1
+2.26.2