Update project maintainer in pyproject.toml

[maxrjones]

I was pinged on this message on the Pangeo discord:

Hey Team! Running into some issues that others are as well. https://github.com/pangeo-data/scikit-downscale has a small bug blocking our ability to upgrade to python 3.12. There is already 3 PRs open all doing the exact same thing which is just changing np.object to object which was deprecated. Would really appreciate if one of these could get merged in

I'm not sure what the status of that project is, since there has not been a lot of activity recently (the last activity was 2 years ago). Also, it still lists @jhamman with his UCAR adress as the author, which I think he said he doesn't have access to anymore?). We can try reaching out to people, though. If it helps, there's ndpyramid, which from a quick glance seems to do something similar.

I think ndpyramid and scikit-downscale fit different needs, so I'm opening this issue to find someone to be listed on as the project maintainer and ideally merge one of the requested PRs. I don't currently have time to help with maintenance.

@jhamman @norlandrhagen @orianac @jukent are any of you able/willing to take on scikit-downscale maintenance and resolve this issue above?