Fix some build warnings (#6832)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/Chemistry/EntitySystems/ReagentDispenserSystem.cs

@@ -11,7 +11,6 @@ namespace Content.Server.Chemistry.EntitySystems
     [UsedImplicitly]
     public sealed class ReagentDispenserSystem : SharedReagentDispenserSystem
     {
-        [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
         public override void Initialize()
         {
             base.Initialize();