chore: cleanup usings and run dotnet format

test/Blog.Tests/EndToEnd/CompositeHost.cs

@@ -6,20 +6,20 @@ public class CompositeHost(IHost testHost, IHost kestrelHost) : IHost
   private readonly IHost _kestrelHost = kestrelHost;
 
   public IServiceProvider Services => _testHost.Services;
-  
+
   public void Dispose()
   {
     _testHost.Dispose();
     _kestrelHost.Dispose();
     GC.SuppressFinalize(this);
   }
-  
+
   public async Task StartAsync(CancellationToken cancellationToken = default)
   {
     await _testHost.StartAsync(cancellationToken);
     await _kestrelHost.StartAsync(cancellationToken);
   }
-  
+
   public async Task StopAsync(CancellationToken cancellationToken = default)
   {
     await _testHost.StopAsync(cancellationToken);