[roll] Roll fuchsia [power][broker] RequiredLevel.Watch return most up-to-date value

Switch to use hanging-get library for RequiredLevel.Watch.

Original-Fixed: b/339092750
Test: fx test power-broker-unittests

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1062918
Original-Revision: 48f0b3dd9150d418b1e4ed79eb7074187b70593c
GitOrigin-RevId: 5f092188cf81449e706866bbfe73cb5769699c17
Change-Id: Iaa442e47d1879fecced176889f59a8c19f9a26d9
diff --git a/stem b/stem
index 119898b..dc962a4 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="0b23e87bb094e073d16eed5d93cbfc3b7cbf5a4c"/>
+             revision="48f0b3dd9150d418b1e4ed79eb7074187b70593c"/>
   </projects>
   <hooks>
     <hook name="install-environment"