I was getting a seemingly unrelated error trying to git fetch upstream main where upstream was a "public" "git-protocol-url" like git://github.com/foo/bar. That's been deprecated and we need to use plain ssh urls... like git@github.com:foo/bar
What I probably didn't need to do, is blow away all my ssh stuff and start from scratch. But I did that, found out I just needed to update the url syntax from git:// to git@github.com:
However, it seems like converting from id_rsa to id_edXXXXX fixed an error with brew update failing to get latest data from my brew taps.