[roll] Roll fuchsia [build] Remove extraneous deps on //zircon/system/ulib/runtime

This should not be used outside the libc implementation and a few
ancient bits of test code.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1241925
Original-Revision: a8786e60f6530f96a3bb40324c85f459ddab9bdd
GitOrigin-RevId: 0b14c9829d3b684e5c4d151fddf17275aed4229b
Change-Id: I9668388641dfa3c646151b72f0a990f9b60debf0
diff --git a/stem b/stem
index c5716cc..036bffb 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="dd16f105b4a972d0e937b3f4a6d5bcd271f03a4b"
+             revision="a8786e60f6530f96a3bb40324c85f459ddab9bdd"
              />
   </projects>
   <hooks>