manibuilder/debian: Add official multi-arch tags for Bookworm

Change-Id: I7915d75d7df89c4d583528c328f37b8694397fc4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73435
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed