Resolve all non-obsoleting warnings in content (#27934)

* Resolve all non-obsoleting warnings in content

* Update ClientGameTicker.cs

* Update SkeletonAccentSystem.cs

* Update BwoinkSystem.cs

Content.Shared/Mind/SharedMindSystem.cs

@@ -26,7 +26,6 @@ public abstract class SharedMindSystem : EntitySystem
     [Dependency] private readonly SharedObjectivesSystem _objectives = default!;
     [Dependency] private readonly SharedPlayerSystem _player = default!;
     [Dependency] private readonly MetaDataSystem _metadata = default!;
-    [Dependency] private readonly ISharedPlayerManager _playerMan = default!;
 
     [ViewVariables]
     protected readonly Dictionary<NetUserId, EntityUid> UserMinds = new();