Update to 1.14.4 (#2333)

Spigot-Server-Patches/Disable-Explicit-Network-Manager-Flushing.patch

@@ -12,7 +12,7 @@ flushing on the netty event loop, so it won't do the flush on the main thread.
 Renable flushing by passing -Dpaper.explicit-flush=true
 
 diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
-index ae60f757e..efd02bd67 100644
+index e2d8ed88f0..08e314af7c 100644
 --- a/src/main/java/net/minecraft/server/NetworkManager.java
 +++ b/src/main/java/net/minecraft/server/NetworkManager.java
 @@ -0,0 +0,0 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
@@ -31,5 +31,5 @@ index ae60f757e..efd02bd67 100644
 +            if (enableExplicitFlush) this.channel.eventLoop().execute(() -> this.channel.flush()); // Paper - we don't need to explicit flush here, but allow opt in incase issues are found to a better version
          }
  
-         if (this.u++ % 20 == 0) {
+         if (this.t++ % 20 == 0) {
 --