github actions: improve actions for go1.17

host: remove ftdi (again)

It's not yet stable enough. Will continue iterating on it.

Bump conn/v3 from v3.6.7 to v3.6.8

No significant change.

Create a formal broken v0

This is to save user from confusion with different version.
It seeds pkg.go.dev with a formal page to redirect them to the right version.

go.mod: update for v3.6.7