manifest: Update nRF hw models to latest

Update the HW models module to:
71bcaa88c97977647d387217dab99f7d6f026815

Including the following:
71bcaa8 hal/nrf_cracen_rng.c: Disable until released
69e9037 hal cracen_rng: Add replacements for proposed cracen_rng hal
71c2507 CRACEN RNG: Corrected one comment
dfbc93a 54 ECB: Corrected behaviour with premature end of input joblist
a46101f 54 AAR, ECB, CCM: Correct a few notes and ECB ERRORSTATUS
74aa2de 54L15: Correct IRQ 261 name
e12ab9c Add CRACEN RNG model
91066e7 docs: UART add PTY backend to shortlist of backends

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