[#236] *: Replace slice.Copy() with bytes.Clone()

The former is deprecated.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

session/object_test.go

@@ -1,6 +1,7 @@
 package session_test
 
 import (
+	"bytes"
 	"crypto/ecdsa"
 	"fmt"
 	"math"
@@ -19,7 +20,6 @@ import (
 	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
 	"github.com/google/uuid"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
-	"github.com/nspcc-dev/neo-go/pkg/util/slice"
 	"github.com/stretchr/testify/require"
 )
 
@@ -200,7 +200,7 @@ func TestObjectProtocolV2(t *testing.T) {
 			breakSign: func(m *v2session.Token) {
 				body := m.GetBody()
 				key := body.GetSessionKey()
-				cp := slice.Copy(key)
+				cp := bytes.Clone(key)
 				cp[len(cp)-1]++
 				body.SetSessionKey(cp)
 			},