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/klauspost/compress/zstd/bytebuf.go

@@ -113,6 +113,9 @@ func (r *readerWrapper) readBig(n int, dst []byte) ([]byte, error) {
 func (r *readerWrapper) readByte() (byte, error) {
 	n2, err := r.r.Read(r.tmp[:1])
 	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
 		return 0, err
 	}
 	if n2 != 1 {