Use a multiarch manifest kernel

The previous kernel being used had only had the amd64 flavor available on
quay. Linuxkit has no sanity check to ensure the fetched image platform
matches the one specified in the command line args. Thus the recent builds
of hook all have an x86_64 kernel for both amd64 and arm64 images.

Signed-off-by: Manuel Mendez <github@i.m.mmlb.dev>

Author: mmlb

hook.yaml

@@ -1,5 +1,5 @@
 kernel:
-  image: quay.io/tinkerbell/hook-kernel:5.10.85
+  image: quay.io/tinkerbell/hook-kernel:5.10.85-5604bb0dc1cdb6263770a82bf91cbf7e00ffdd5c
   cmdline: "console=tty0 console=ttyS0 console=ttyAMA0 console=ttysclp0"
 
 init: