Don't mind hosting it, but what to do here?
I understand your conundrum. Is there any copyright or license in the source code? Something that limits what you can do?
My gut feeling is that if there isn't license, yet the author made the code available, that would you be free to maintain the source code in your own repository.
This has happened a few times over the years, and will continue again. Where this has happened, fully disclose what's going on in the wiki, and in the source code.