exec hof mod vendor

! exec hof mod get github.com/hofstadter-io/hof@v0.6.8-beta.3

-- cue.mod/module.cue --
module: "hof.io/test"
cue:    "0.6.0"

require: {
	"github.com/hofstadter-io/hof": "v0.6.8-beta.3"
}
