VPA: wrap clusterStateFeeder error idiomatically

The package `github.com/pkg/errors` has been archived, and it doesn't
look like there is any requirement for its unique features.
Instead, wrap the error using extended error feature added in Go 1.13.

Background info at https://stackoverflow.com/a/61955455/448734

Signed-off-by: Bryan Boreham <[email protected]>

Author: bboreham

vertical-pod-autoscaler/pkg/recommender/input/cluster_feeder.go

@@ -23,7 +23,6 @@ import (
 	"slices"
 	"time"
 
-	"github.com/pkg/errors"
 	apiv1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/fields"
@@ -349,7 +348,7 @@ func (feeder *clusterStateFeeder) cleanupCheckpointsForNamespace(namespace strin
 		vpaID := model.VpaID{Namespace: checkpoint.Namespace, VpaName: checkpoint.Spec.VPAObjectName}
 		if !allVPAKeys[vpaID] {
 			if errFeeder := feeder.vpaCheckpointClient.VerticalPodAutoscalerCheckpoints(namespace).Delete(context.TODO(), checkpoint.Name, metav1.DeleteOptions{}); errFeeder != nil {
-				err = errors.Wrapf(err, "failed to delete orphaned checkpoint %s", klog.KRef(namespace, checkpoint.Name))
+				err = fmt.Errorf("failed to delete orphaned checkpoint %s: %w", klog.KRef(namespace, checkpoint.Name), err)
 				continue
 			}
 			klog.V(3).InfoS("Orphaned VPA checkpoint cleanup - deleting", "checkpoint", klog.KRef(namespace, checkpoint.Name))