update mos to temporary new version

We need a new version in order for mosctl to use the right mediatype
when querying zot during initrd.

Signed-off-by: Serge Hallyn <shallyn@cisco.com>

subs.mk

@@ -2,7 +2,7 @@ KEYSET ?= snakeoil
 DOCKER_BASE ?= docker://
 UBUNTU_MIRROR ?= http://archive.ubuntu.com/ubuntu
 KEYSET_D ?= $(HOME)/.local/share/machine/trust/keys/$(KEYSET)
-MOSCTL_BINARY ?= https://github.com/project-machine/mos/releases/download/0.0.12/mosctl
+MOSCTL_BINARY ?= https://github.com/project-machine/mos/releases/download/v0.0.13/mosctl
 ZOT_BINARY ?= https://github.com/project-zot/zot/releases/download/v2.0.0-rc5/zot-linux-amd64-minimal
 
 STACKER_SUBS = \