[Build] Forgot to remove two TaskEx

sources/core/Stride.Core.MicroThreading/AsyncAutoResetEvent.cs

@@ -8,7 +8,7 @@ namespace Stride.Core.MicroThreading
     public class AsyncAutoResetEvent
     {
         // Credit: http://blogs.msdn.com/b/pfxteam/archive/2012/02/11/10266923.aspx
-        private static readonly Task Completed = TaskEx.FromResult(true);
+        private static readonly Task Completed = Task.FromResult(true);
         private readonly Queue<TaskCompletionSource<bool>> waits = new Queue<TaskCompletionSource<bool>>();
         private bool signaled;
 

sources/core/Stride.Core.MicroThreading/MicroThreadSynchronizationContext.cs

@@ -26,7 +26,7 @@ public override void Post(SendOrPostCallback d, object state)
             // in which case we will directly execute the callback to avoid further processing from scheduler.
             // Also, note that Wait() sends us event that are supposed to come back into scheduler.
             // Note: As it will end up on the callstack, it might be better to Schedule it instead (to avoid overflow)?
-            // 2/ Otherwise, we just received an external task continuation (i.e. TaskEx.Sleep()), or a microthread triggering another,
+            // 2/ Otherwise, we just received an external task continuation (i.e. Task.Sleep()), or a microthread triggering another,
             // so schedule it so that it comes back in our regular scheduler.
             if (microThread.Scheduler.RunningMicroThread == microThread)
             {