[roll] Roll fuchsia [gpt] More dependency shuffling

This makes the gpt library not dependent on the concrete implementations
of BlockClient. The concrete implementation has dependencies that aren't
compatible with drivers.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/971632
Original-Revision: de81373c3c8c48ae6850042f5ccda8e32ab472bd
GitOrigin-RevId: babdb8e26e7e39a9568c09040ceb0c9451154a88
Change-Id: Ic3004f8a505133089a02a609a8c14d60a1156ca3
diff --git a/stem b/stem
index a9bbff0..6fd8bfd 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="9b355c8955147fc253638975758daf5335fe7041"/>
+             revision="de81373c3c8c48ae6850042f5ccda8e32ab472bd"/>
   </projects>
   <hooks>
     <hook name="install-environment"