[roll] Roll fuchsia [components][sandbox] Replace WeakDict with Router

This was added in https://fxrev.dev/1044832 to break a cycle, but we
don't need it. We can instead use a Router that returns the Dict.

Original-Fixed: 341123545
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1049728
Original-Revision: f8485dbcb2f76d5ace7cd41cb6000001379f3ed1
GitOrigin-RevId: 01f9b7b5031e234474f3b243465639aac4d2de6c
Change-Id: Icbbcd54312a11cdb7d406e471315ac83f68460ea
diff --git a/stem b/stem
index 3781d04..400bde8 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="bdfbf0dff37667f4ca2ffaad0140ed2f8e3d15bb"/>
+             revision="f8485dbcb2f76d5ace7cd41cb6000001379f3ed1"/>
   </projects>
   <hooks>
     <hook name="install-environment"