The previous CVE bugfix commit did not adjust PKG_RELEASE, therefor the
fixed samba package does not appear as opkg update.
Bump the PKG_RELEASE to signify upgrades to downstream users.
Ref: https://forum.lede-project.org/t/sambacry-are-lede-devices-affected/3972/4
Signed-off-by: Jo-Philipp Wich <jo@mein.io>