zephyr: nrf_wifi: Update RPU patch to rev#976e17b7645

  UMAC:
    [SHEL-3918] : Need support to suppress 11b rates in P2P probe
                  requests.
    Firmware Version update from 1.2.14.4 to 1.2.14.5

  LMAC:
    [NRF7X-375] : Firmware bug causing broadcast BSSID fields in
                  beacons causing frames to be dropped in Wi-Fi
                  Monitor mode.
    Fix for race condition while sending keep alive frame.

Signed-off-by: Karun Kumar Eagalapati <[email protected]>

Author: karun2796