package/cifs-utils: security bump to version 6.13

package/cifs-utils: security bump to version 6.13

Fix CVE-2021-20208: A flaw was found in cifs-utils in versions before
6.13. A user when mounting a krb5 CIFS file system from within a
container can use Kerberos credentials of the host. The highest threat
from this vulnerability is to data confidentiality and integrity.

https://lists.samba.org/archive/samba-technical/2021-April/136467.html

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>