[roll] Roll fuchsia [cobalt] Switch CobaltApp to use fallible CobaltService contstructor

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/684387
Original-Revision: 29fcac7ba72a7c142ef78eabede7fc695867072f
GitOrigin-RevId: c49c10f38b0b9a146e6def4a5e92f3c73855db71
Change-Id: I05513a7b9bfc5032e27e677662c1510561d8e862
diff --git a/stem b/stem
index 499f066..5acb77d 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="e43777dbde6895eb4d9a5d17a4b5e6678414164b"/>
+             revision="29fcac7ba72a7c142ef78eabede7fc695867072f"/>
   </projects>
   <hooks>
     <hook name="install-environment"