manifest: update hal_nordic to have SAADC samples aligned to 3.12 API

NRFX_SAADC_SAMPLE_GET() macro takes two arguments now
instead of three.

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

Author: nika-nordic

west.yml

@@ -200,7 +200,7 @@ manifest:
       groups:
         - hal
     - name: hal_nordic
-      revision: 6e39d4f2b078afaebdb84875089486152fcacb9c
+      revision: pull/304/head
       path: modules/hal/nordic
       groups:
         - hal