modules: hal_nordic: Update nrfx to version 2.8.0

Update the hal_nordic module revision, to switch to nrfx v2.8.0.

nrfx 2.8.0 includes improvements to SAADC driver that will
allow using nrfx_saadc API directly in the Zephyr ADC shim.

Signed-off-by: Nikodem Kastelik <nikodem.kastelik@nordicsemi.no>
1 file changed