[]byte encoded as string with postgres dialect

[MokoshHydro]

Describe the bug

[]byte are encoded as strings leading to queries not accepted by Postgres.

To Reproduce

package main
import (
	"log"
	"github.com/doug-martin/goqu/v9"
)

type Test struct {
	Total uint32 `db:"total"`
	CardHash []byte `db:"card_hash"`
}

func main() {
	dialect := goqu.Dialect("postgres")
	t := &Test{
		Total: 100,
		CardHash: []byte{40, 41, 42, 250, 0x0, 0x0},
	}
	req := dialect.Insert("transactions").Rows(goqu.Record{"total": t.Total, "hash": t.CardHash}).Returning("id")
	sql, _, err := req.ToSQL()
	if err != nil {
		log.Fatal(err)
	}
	log.Println(sql)
	req = dialect.Insert("transactions").Rows(t).Returning("id")
	sql, _, err = req.ToSQL()
	if err != nil {
		log.Fatal(err)
	}
	log.Println(sql)
}

Expected behavior

[]byte must be "hexified".

Dialect:

• postgres
• mysql
• sqlite3

Additional context

Related #353.