Hi,

I've done some analysis of the vendor directory, and it contains a
massive list of missed Guix packages. I see that version 0.16.0 is not
the latest upstream version for that reason.

A quick review of the required modules for the latest version of *kubo*,
v0.25.0, shows that it requires significant packaging efforts.
Hopefully, some of the missing ones will be covered after all pending
patches related to Golang are merged.

https://github.com/ipfs/kubo/blob/v0.25.0/go.mod

Keep this message here for future reference regarding the update of
*kubo*.

Quick rough script to check missing packages
--8<---------------cut here---------------start------------->8---
cd vendor
find * -maxdepth 2 -mindepth 2 -type d |
    sed -e 's/[\.\/]/-/g' |
    sort |
    while read -r m
    do
        echo "go-$m"
    done |
    while read -r p
    do
        guix show $p 2>&1
    done |
    grep "package not found" |
    tee kubo-vendor-package-not-found
--8<---------------cut here---------------start------------->8---

Pushed as