[roll] Roll fuchsia [fint] Don't run ninja build.ninja

We will run `gn gen` unconditionally, so this step may cost an extra
`gn gen` invocation unnecessarily.

Original-Bug: 84694
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/582531
Original-Revision: 5da00d05c6d0c42a6f745fa7327148db6bfa79c3
GitOrigin-RevId: 4e4d7bb2e52630eccd13122977441f88c9647f9a
Change-Id: I896cbdc4543a0fdbe374f4f13d2811e109fdfd60
diff --git a/stem b/stem
index bae7374..4c1d8c1 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="10d0aba092cf0950f72ec9307321c0c96d04de37"/>
+             revision="5da00d05c6d0c42a6f745fa7327148db6bfa79c3"/>
   </projects>
   <hooks>
     <hook name="install-environment"