Prepare for 1.16.4

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -40,7 +40,8 @@ public enum ProtocolVersion {
   MINECRAFT_1_16(735, "1.16"),
   MINECRAFT_1_16_1(736, "1.16.1"),
   MINECRAFT_1_16_2(751, "1.16.2"),
-  MINECRAFT_1_16_3(753, "1.16.3");
+  MINECRAFT_1_16_3(753, "1.16.3"),
+  MINECRAFT_1_16_4(754, "1.16.4");
 
   private final int protocol;
   private final String name;