Use canonical json-patch v4 import

The canonical import for json-patch v4 is
gopkg.in/evanphx/json-patch.v4 (see
https://github.com/evanphx/json-patch/blob/master/README.md#get-it for
reference).

Using the v4-specific path should also reduce the risk of unwanted v5
upgrade attempts, because they won't be offered as automated upgrades
by dependency upgrade management tools, and they won't happen through
indirect dependencies (see
https://github.com/kubernetes/kubernetes/pull/120327 for context).

Signed-off-by: Stephen Kitt <skitt@redhat.com>

test/integration/controlplane/audit/audit_test.go

@@ -46,7 +46,7 @@ import (
 	"k8s.io/kubernetes/test/integration/framework"
 	"k8s.io/kubernetes/test/utils"
 
-	jsonpatch "github.com/evanphx/json-patch"
+	jsonpatch "gopkg.in/evanphx/json-patch.v4"
 )
 
 const (

test/integration/dualstack/dualstack_test.go

@@ -24,7 +24,7 @@ import (
 	"testing"
 	"time"
 
-	jsonpatch "github.com/evanphx/json-patch"
+	jsonpatch "gopkg.in/evanphx/json-patch.v4"
 
 	v1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"