Updates the content components to be compatible with the changes in 55a50ff7ba.

Updates engine submodule.

Content.Server/GameObjects/Components/Research/ResearchClientComponent.cs

@@ -1,4 +1,4 @@
-using Content.Server.GameObjects.EntitySystems;
+using Content.Server.GameObjects.EntitySystems;
 using Content.Shared.GameObjects.Components.Research;
 using Robust.Server.GameObjects.Components.UserInterface;
 using Robust.Server.Interfaces.GameObjects;
@@ -99,7 +99,8 @@ namespace Content.Server.GameObjects.Components.Research
             }
         }
 
-        public override void Shutdown()
+        /// <inheritdoc />
+        protected override void Shutdown()
         {
             base.Shutdown();
             UnregisterFromServer();