Remove all Assigned Values that are Never Used (#30110)

Remove all Assigned Values that are never used

Content.Server/Traits/TraitSystem.cs

@@ -11,7 +11,6 @@ namespace Content.Server.Traits;
 public sealed class TraitSystem : EntitySystem
 {
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
-    [Dependency] private readonly ISerializationManager _serializationManager = default!;
     [Dependency] private readonly SharedHandsSystem _sharedHandsSystem = default!;
     [Dependency] private readonly EntityWhitelistSystem _whitelistSystem = default!;