[roll] Roll fuchsia [ffx] change host_pipe timeout to 50 seconds

We are seeing failures (e.g. fxb/132401) when the host pipe times
out before the emulator under ASAN is ready. The emulator serial logs
suggest that it becomes ready only a couple seconds later, so we can
hopefully mitigate this by extending the timeout.

We don't want to extend it _too_ far (e.g. 60+ seconds) or it may start
racing with other timeouts, preventing diagnosis of certain failures.

Original-Bug: fxb/132401
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/905922
Original-Revision: 31eba7792ec370cc940e04c6efb16c017f9db8b3
GitOrigin-RevId: 48dabd2a7c413ae2818688d089f54068cf20a9ce
Change-Id: Ib49ba0355bced8f3d8030d75a5ab837379f69d0a
diff --git a/stem b/stem
index e135010..ecac763 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="512c84d2b8c97aa33017fb1a6ce066bcdb05c362"/>
+             revision="31eba7792ec370cc940e04c6efb16c017f9db8b3"/>
   </projects>
   <hooks>
     <hook name="install-environment"