Use the new CreateAsyncScope() API introduced in .NET 6.0

samples/Mvc.Server/Worker.cs

@@ -14,7 +14,7 @@ public class Worker : IHostedService
 
     public async Task StartAsync(CancellationToken cancellationToken)
     {
-        using var scope = _serviceProvider.CreateScope();
+        await using var scope = _serviceProvider.CreateAsyncScope();
 
         var context = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
         await context.Database.EnsureCreatedAsync(cancellationToken);