Update github.com/containerd/containerd

$ go get -u github.ccom/containerd/containerd
$ make vendor

... to silence warnings about https://github.com/advisories/GHSA-crp2-qrr5-8pq7 ,
in code we don't use.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

vendor/github.com/Microsoft/go-winio/pkg/guid/guid.go

@@ -14,8 +14,6 @@ import (
 	"encoding/binary"
 	"fmt"
 	"strconv"
-
-	"golang.org/x/sys/windows"
 )
 
 // Variant specifies which GUID variant (or "type") of the GUID. It determines
@@ -41,13 +39,6 @@ type Version uint8
 var _ = (encoding.TextMarshaler)(GUID{})
 var _ = (encoding.TextUnmarshaler)(&GUID{})
 
-// GUID represents a GUID/UUID. It has the same structure as
-// golang.org/x/sys/windows.GUID so that it can be used with functions expecting
-// that type. It is defined as its own type so that stringification and
-// marshaling can be supported. The representation matches that used by native
-// Windows code.
-type GUID windows.GUID
-
 // NewV4 returns a new version 4 (pseudorandom) GUID, as defined by RFC 4122.
 func NewV4() (GUID, error) {
 	var b [16]byte