[roll] Roll fuchsia [build][drivers] Fix default_dispatcher_opts usage.

This should be an array, not a string.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/732083
Original-Revision: 600bcf8658f2795e962ae02d2627b7bbab4e9863
GitOrigin-RevId: 32baabec03da9c62b591b6380e7b775a5fb04fa3
Change-Id: Iad97482dd9bb104c666c40f49ccd2a15b94cb447
diff --git a/stem b/stem
index bb37e3b..43248e1 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="4f2e34b1ee8493b07edb79b00a70363fc356b1e0"/>
+             revision="600bcf8658f2795e962ae02d2627b7bbab4e9863"/>
   </projects>
   <hooks>
     <hook name="install-environment"