manifest: Update nrf hw models to latest

* Update the HW models module to
c744f2c762aad79e59bd7e99002f2fcab0a2f288

Including the following:
* docs: UART: several minor fixes
* UART(E): Add peripherals and connect to (D)PPI

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>