Fix warning CS0414 instances (#36832)

Fix warning cs0414 instances

Content.Shared/CombatMode/SharedCombatModeSystem.cs

@@ -11,7 +11,6 @@ namespace Content.Shared.CombatMode;
 public abstract class SharedCombatModeSystem : EntitySystem
 {
     [Dependency] protected readonly IGameTiming Timing = default!;
-    [Dependency] private   readonly INetManager _netMan = default!;
     [Dependency] private   readonly SharedActionsSystem _actionsSystem = default!;
     [Dependency] private   readonly SharedPopupSystem _popup = default!;
     [Dependency] private   readonly SharedMindSystem  _mind = default!;