manifest: update hal_nordic revision

The new hal_nordic revision brings changes in nrf-802154 component
related to CCA threshold configuration.
The CCA threshold configuration is now done in dBm units.

Signed-off-by: Rafał Kuźnia <[email protected]>

Author: e-rk

west.yml

@@ -200,7 +200,7 @@ manifest:
       groups:
         - hal
     - name: hal_nordic
-      revision: 243c6708278364516c6ca1dcccc00c5f721095fa
+      revision: pull/296/head
       path: modules/hal/nordic
       groups:
         - hal