chore: avoid including github.com/pkg/errors

as requsted in review

Author: mflendrich

go.mod

@@ -13,7 +13,6 @@ require (
 	github.com/kong/go-kong v0.13.0
 	github.com/lithammer/dedent v1.1.0
 	github.com/mitchellh/mapstructure v1.3.1
-	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.7.1
 	github.com/sirupsen/logrus v1.6.0
 	github.com/spf13/pflag v1.0.5

internal/ingress/utils/ingressapi.go

@@ -3,7 +3,6 @@ package utils
 import (
 	"fmt"
 
-	"github.com/pkg/errors"
 	extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
 	networkingv1 "k8s.io/api/networking/v1"
 	networkingv1beta1 "k8s.io/api/networking/v1beta1"
@@ -50,7 +49,7 @@ func NegotiateResourceAPI(client discovery.ServerResourcesInterface, kind string
 ) (IngressAPI, error) {
 	for _, candidate := range allowedVersions {
 		if ok, err := serverHasGVK(client, candidate.String(), kind); err != nil {
-			return OtherAPI, errors.Wrapf(err, "serverHasGVK(%v): ", candidate)
+			return OtherAPI, err
 		} else if ok {
 			return candidate, nil
 		}

internal/ingress/utils/ingressapi_test.go

@@ -1,9 +1,9 @@
 package utils
 
 import (
+	"errors"
 	"testing"
 
-	"github.com/pkg/errors"
 	"github.com/stretchr/testify/require"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/discovery"