[roll] Roll fuchsia [storage] Update conformance test for optional rights

Make it more explicit that optional rights are removed if not present in
the parent connection.

Test: fx test fxfs-conformance-test
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/971634
Original-Revision: 9b355c8955147fc253638975758daf5335fe7041
GitOrigin-RevId: d098953f775f434c76dcd452285e06a693b421f5
Change-Id: I6ae6739abc9b585255439d3c889b168f936e176d
diff --git a/stem b/stem
index ff2c105..a9bbff0 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="d2bcb8ba015c8b741d742370371d73685206aa13"/>
+             revision="9b355c8955147fc253638975758daf5335fe7041"/>
   </projects>
   <hooks>
     <hook name="install-environment"