Pgx (#2902)

* change postgres driver  to  pgx

* modified:   go.mod
	modified:   go.sum

* chore: tidy go.sum

---------

Co-authored-by: Kevin Wan <wanjunfeng@gmail.com>

core/stores/postgres/postgresql.go

@@ -2,11 +2,11 @@ package postgres
 
 import (
 	// imports the driver, don't remove this comment, golint requires.
-	_ "github.com/lib/pq"
+	_ "github.com/jackc/pgx/v5"
 	"github.com/zeromicro/go-zero/core/stores/sqlx"
 )
 
-const postgresDriverName = "postgres"
+const postgresDriverName = "pgx"
 
 // New returns a postgres connection.
 func New(datasource string, opts ...sqlx.SqlOption) sqlx.SqlConn {