Updated Upstream (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

CraftBukkit Changes:
5da21f87 SPIGOT-6152: End exit gates in custom ends do not send back to overworld
1ee373fe SPIGOT-6157: Crash when PortalCreateEvent cancelled

Spigot-Server-Patches/0576-Fix-block-data-exception-when-cancelling-PortalCreat.patch

@@ -1,40 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Shane Freeder <theboyetronic@gmail.com>
-Date: Thu, 10 Sep 2020 09:00:02 +0100
-Subject: [PATCH] Fix block data exception when cancelling PortalCreateEvent
-
-
-diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
-index 04f14691ba9b0552b2c195c4a3b47f45cd72c5a2..11fa231caa5be12a43e646eb2c0300e597d25dd2 100644
---- a/src/main/java/net/minecraft/server/EntityPlayer.java
-+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
-@@ -1028,7 +1028,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
-             Optional<BlockUtil.Rectangle> optional1 = worldserver.getTravelAgent().createPortal(blockposition, enumdirection_enumaxis, this, createRadius); // CraftBukkit
- 
-             if (!optional1.isPresent()) {
--                EntityPlayer.LOGGER.error("Unable to create a portal, likely target out of worldborder");
-+                //EntityPlayer.LOGGER.error("Unable to create a portal, likely target out of worldborder"); // Paper
-             }
- 
-             return optional1;
-diff --git a/src/main/java/net/minecraft/server/PortalTravelAgent.java b/src/main/java/net/minecraft/server/PortalTravelAgent.java
-index 205f3f697e9c31674a4ac8db38467bb2e61cfe6b..9273fc22df2c9618efb09a8f95fd7e7f08652f88 100644
---- a/src/main/java/net/minecraft/server/PortalTravelAgent.java
-+++ b/src/main/java/net/minecraft/server/PortalTravelAgent.java
-@@ -120,6 +120,7 @@ public class PortalTravelAgent {
-             EnumDirection enumdirection1 = enumdirection.g();
- 
-             if (!worldborder.a(blockposition1)) {
-+                MinecraftServer.LOGGER.error("Unable to create a portal, likely target out of worldborder"); // Paper - restore this message
-                 return Optional.empty();
-             }
- 
-@@ -160,7 +161,7 @@ public class PortalTravelAgent {
-         this.world.getServer().getPluginManager().callEvent(event);
-         if (!event.isCancelled()) {
-             blockList.updateList();
--        }
-+        } else return Optional.empty(); // Paper
-         // CraftBukkit end
-         return Optional.of(new BlockUtil.Rectangle(blockposition1.immutableCopy(), 2, 3));
-     }

work/CraftBukkit

@@ -1 +1 @@
-Subproject commit a339310c48548f0f82f923ff3f5fe2cdc7a8e8ba
+Subproject commit 5da21f87d6b0953f73941e68f5a09dc473d7cd5e