Possible support for spago-next

[JulianLeviston]

Hi, first of all, I want to thank you for the incredible work you've put into this library. It’s been a fantastic to use!

The latest Spago is still in alpha, but I’m curious about your thoughts on potentially supporting it. It might be a bit early, but I wanted to understand the process for transitioning to it. Is there maybe a way to support both the old and new versions simultaneously?

A while back I made a fork to support it for my own project which is here if you're interested in taking a look: https://github.com/GetContented/purescript-graphql-client/commits/fix/default-exchanges-and-tests

Thanks again for all your hard work and for considering this!