manifest: Update sdk-find-my revision

Backport manifest update for
nrfconnect/sdk-find-my#339.

Signed-off-by: Aleksander Strzebonski <[email protected]>

Author: alstrzebonski

west.yml

@@ -197,7 +197,7 @@ manifest:
           compare-by-default: false
     - name: find-my
       repo-path: sdk-find-my
-      revision: v3.1.0-rc1
+      revision: 5fbf123bb46fc12b3bc39411817685c1e9cdbe43
       groups:
         - find-my
     - name: azure-sdk-for-c