[roll] Roll fuchsia [Starnix] Remove netstack dep in Starnix tests

Starnix tests had direct dependency on netstack. That was breaking the
build on RISC-V where netstack2 is not supported. Updated the tests
to use nestack-for-tests, which uses netstack3 when necessary.

Original-Bug: b/297312145
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/922032
Original-Revision: 8e489c374e60518a218dca83a4d27c03614a4af4
GitOrigin-RevId: fb62310be2e219f1db42bbb7e31746bab1d86649
Change-Id: Iefd179d59ce984a9e6c6e20c83df1a27ab2da6b2
diff --git a/stem b/stem
index b09274f..560b6f6 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="e594680ec729d2a1d15e8c788fbfad4c6ee40ec8"/>
+             revision="8e489c374e60518a218dca83a4d27c03614a4af4"/>
   </projects>
   <hooks>
     <hook name="install-environment"