FTR, we had a discussion about this on IRC:

conclusion:

ideally, Guix should have a pinned package for each go dependency, and with the go importer it's not hopeless to do anymore.

it conflicts with the general Guix policy to package the latest releases, so i'm putting all the pinned packages generated by `guix go import` into a separate go-ethereum.scm, and into a separate module.

any correction/guidance is welcome!