Upgrade to blang/semver/v4 v4.0.0

This is the first version to be fully go-mod-compatible.

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

cluster/images/etcd/migrate/data_dir_test.go

@@ -21,7 +21,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 )
 
 var (

cluster/images/etcd/migrate/integration_test.go

@@ -37,7 +37,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 	"k8s.io/klog/v2"
 	netutils "k8s.io/utils/net"
 )

cluster/images/etcd/migrate/migrator.go

@@ -21,7 +21,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 	"k8s.io/klog/v2"
 )
 

cluster/images/etcd/migrate/versions.go

@@ -20,7 +20,7 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 )
 
 // EtcdVersion specifies an etcd server binaries SemVer.

cluster/images/etcd/migrate/versions_test.go

@@ -19,7 +19,7 @@ package main
 import (
 	"testing"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 )
 
 func TestSerializeEtcdVersionPair(t *testing.T) {