synch with upstream ce503341

Synchronized up to:
https://github.com/mcu-tools/mcuboot/commit/ce503341ad22a100f3d0278e3bd149f5a0ecd834



- ci: relax signed-off-by checks on forks

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>