[roll] Roll fuchsia [ctf][disable-tests] Add GUI

Add a Tkinter GUI option, activated with --gui.

Original-Bug: b/412727988

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1270884
Original-Revision: a2fd88b0bcc460536a1e32290b01d8eefaa0dbc5
GitOrigin-RevId: 18a39b813f6efd75fcec564df3ac35f8bad59585
Change-Id: I3f1c2c56bd5f69d5d73b2b98529b92e2ed2f8205
diff --git a/stem b/stem
index b0e7dd3..e6cb83f 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="303bb7cd90eb63b8db33515934a3867c990704b1"
+             revision="a2fd88b0bcc460536a1e32290b01d8eefaa0dbc5"
              />
   </imports>
   <projects>