Draft: tests/dnstap: update go.mod and remove go.sum
This includes https://github.com/CZ-NIC/knot-resolver/pull/108 and should stop automatic 'go.mod' changes from annoying us, at least for now. Seems to be working with go 1.17, 1.19, and 1.21.
Draft status: Currently not working with our Debian 11 CI. I think we should just update it.