Updated Upstream (CraftBukkit/Spigot) (#7580)

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:
881e06e5 PR-725: Add Item Unlimited Lifetime APIs

CraftBukkit Changes:
74c08312 SPIGOT-6962: Call EntityChangeBlockEvent when when FallingBlockEntity starts to fall
64db5126 SPIGOT-6959: Make /loot command ignore empty items for spawn
2d760831 Increase outdated build delay
9ed7e4fb SPIGOT-6138, SPIGOT-6415: Don't call CreatureSpawnEvent after cross-dimensional travel
fc4ad813 SPIGOT-6895: Trees grown with applyBoneMeal() don't fire the StructureGrowthEvent
59733a2e SPIGOT-6961: Actually return a copy of the ItemMeta

Spigot Changes:
ffceeae3 SPIGOT-6956: Drop unload queue patch as attempt at fixing stop issue
e19ddabd PR-1011: Add Item Unlimited Lifetime APIs
34d40b0e SPIGOT-2942: give command fires PlayerDropItemEvent, cancelling it causes Item Duplication

patches/server/Further-improve-server-tick-loop.patch

@@ -31,8 +31,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 -    private static final int SAMPLE_INTERVAL = 100;
 +    private static final int SAMPLE_INTERVAL = 20; // Paper
      public final double[] recentTps = new double[ 3 ];
-     public final SlackActivityAccountant slackActivityAccountant = new SlackActivityAccountant();
      // Spigot end
+     public static long currentTickLong = 0L; // Paper
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
      {
          return ( avg * exp ) + ( tps * ( 1 - exp ) );