Update dependencies (#5518)

vendor/github.com/google/go-containerregistry/pkg/authn/keychain.go

@@ -16,7 +16,6 @@ package authn
 
 import (
 	"os"
-	"sync"
 
 	"github.com/docker/cli/cli/config"
 	"github.com/docker/cli/cli/config/types"
@@ -43,9 +42,7 @@ type Keychain interface {
 
 // defaultKeychain implements Keychain with the semantics of the standard Docker
 // credential keychain.
-type defaultKeychain struct {
-	mu sync.Mutex
-}
+type defaultKeychain struct{}
 
 var (
 	// DefaultKeychain implements Keychain by interpreting the docker config file.
@@ -60,8 +57,6 @@ const (
 
 // Resolve implements Keychain.
 func (dk *defaultKeychain) Resolve(target Resource) (Authenticator, error) {
-	dk.mu.Lock()
-	defer dk.mu.Unlock()
 	cf, err := config.Load(os.Getenv("DOCKER_CONFIG"))
 	if err != nil {
 		return nil, err