[roll] Roll fuchsia [ui][a11y] Put ColorConverter connection behind AttachA11yView flag

This CL puts connection to ColorConverter protocol behind the existing
flag AttachA11yView. With this change, there is nothing that starts
A11yManager by default in SceneManager if AttachA11yView is false.

Original-Bug: 385200977
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1207064
Original-Revision: d6a499e0b9b9adbfdcc165a1d633552b8b216cf5
GitOrigin-RevId: 47f62634fb0a43f43ca70a27cc63180d26b1e9c9
Change-Id: Icada3ef3fa917797bda6b96186ecf31ed0f284d8
diff --git a/stem b/stem
index 2e97130..3b4b2c6 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="c49c0d48c6f015938e3899900b605a60f8df3c39"/>
+             revision="d6a499e0b9b9adbfdcc165a1d633552b8b216cf5"/>
   </projects>
   <hooks>
     <hook name="install-environment"