Add note about .NET 7 stream and pipe cancellation

src/Menees.Remoting/Models/Message.cs

@@ -118,6 +118,8 @@ private static async Task<byte[]> RequireReadAsync(Stream stream, int requiredCo
 
 		// In .NET Framework the stream.ReadAsync implementation ignores cancellationToken.
 		// This is a workaround. https://stackoverflow.com/a/12893018/1882616
+		// .NET 7 adds full support for stream and pipe cancellation.
+		// https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7/#file-i-o
 		using CancellationTokenRegistration registration = cancellationToken.Register(() => stream.Close());
 
 		// We'll check cancellation before and after each operation so we don't get an ObjectDisposedException