Fix dangerously threaded beacons

nms-patches/BlockBeacon.patch

@@ -0,0 +1,19 @@
+--- a/net/minecraft/server/BlockBeacon.java
++++ b/net/minecraft/server/BlockBeacon.java
+@@ -49,7 +49,7 @@
+     }
+ 
+     public static void a(World world, BlockPosition blockposition) {
+-        HttpUtilities.a.submit(() -> {
++        // HttpUtilities.a.submit(() -> { // CraftBukkit - dangerously threaded
+             Chunk chunk = world.getChunkAtWorldCoords(blockposition);
+ 
+             for (int i = blockposition.getY() - 1; i >= 0; --i) {
+@@ -74,6 +74,6 @@
+                 }
+             }
+ 
+-        });
++        // }); // CraftBukkit
+     }
+ }