Fix warning

MareSynchronos/Services/Mediator/MareMediator.cs

@@ -7,7 +7,7 @@ using System.Text;
 
 namespace MareSynchronos.Services.Mediator;
 
-public sealed class MareMediator : IHostedService
+public sealed class MareMediator : IHostedService, IDisposable
 {
     private readonly Lock _addRemoveLock = new();
     private readonly ConcurrentDictionary<SubscriberAction, DateTime> _lastErrorTime = [];
@@ -109,6 +109,12 @@ public sealed class MareMediator : IHostedService
         }
     }
 
+    public void Dispose()
+    {
+        _loopCts.Cancel();
+        _loopCts.Dispose();
+    }
+
     public void SubscribeKeyed<T>(IMediatorSubscriber subscriber, string key, Action<T> action) where T : MessageBase
     {
         lock (_addRemoveLock)
@@ -219,4 +225,4 @@ public sealed class MareMediator : IHostedService
         public object Action { get; }
         public IMediatorSubscriber Subscriber { get; }
     }
-}
+}