manifest: update sdk-find-my revision to use new nrf_power_gpregret

The code was aligned to new nrf_power API related
to GPREGRET registers management.

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

west.yml

@@ -200,7 +200,7 @@ manifest:
         - homekit
     - name: find-my
       repo-path: sdk-find-my
-      revision: v2.5.0
+      revision: b972afd32f2b6ab028320badb2e35f857b8fc158
       groups:
         - find-my
     - name: azure-sdk-for-c