[roll] Roll fuchsia [kernel][tests] Avoid self-move

GCC 13's reports -Wself-move warnings for `x = ktl::move(x)`.
So do two moves instead.

Original-Bug: 126220
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/847456
Original-Revision: c4daee0970895fa8d09811c76885297a1efbfe48
GitOrigin-RevId: 9c21ebf69d25443c159c6af1afdec96975b00192
Change-Id: I419856fb1430264394625e959b28e45304de1b90

stem

diff --git a/stem b/stem
index 16dc2ac..847ca27 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="7ac9cde30ce42e1346d825743ee572ea3801687b"/>
+             revision="c4daee0970895fa8d09811c76885297a1efbfe48"/>
   </projects>
   <hooks>
     <hook name="install-environment"