We use ServicePointManager here:

https://github.com/xamarin/xamarin-macios/blob/e15955bb6739dacfbb51743934438439324b30c9/src/Foundation/NSUrlSessionHandler.cs#L161-L171

but ServicePointManager is obsolete in .NET 9 (dotnet/runtime#71836), so we need to come up with a replacement.