use fmt and errors pkg from std lib for newPackageCmd

Signed-off-by: James Sheppard <jgsheppa@protonmail.com>

cmd/helm/package.go

@@ -17,12 +17,12 @@ limitations under the License.
 package main
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
 
-	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"helm.sh/helm/v3/pkg/action"
@@ -57,7 +57,7 @@ func newPackageCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 		Long:  packageDesc,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if len(args) == 0 {
-				return errors.Errorf("need at least one argument, the path to the chart")
+				return fmt.Errorf("need at least one argument, the path to the chart")
 			}
 			if client.Sign {
 				if client.Key == "" {