[roll] Roll fuchsia [virtualization] Remove guest test timeouts

These can only introduce timing-related flakes.

Original-Bug: 50820
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/572905
Original-Revision: 5d921234b10b69a77fbac50d71c82387d2313edf
GitOrigin-RevId: 090c049b286a98ead09669319b86cc7739fae8e2
Change-Id: I2bc29511d8b9c2fa0fb2b6f533a6199af132eea5
diff --git a/stem b/stem
index e5fb42f..bdf8165 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="15091dc1bcc3b81be8ac97dcd5bb74c973f5717b"/>
+             revision="5d921234b10b69a77fbac50d71c82387d2313edf"/>
   </projects>
   <hooks>
     <hook name="install-environment"