[roll] Roll fuchsia [tools] Add ffx to test_infra tools.

This will include it in the build graph for bringup builders where it
previously was not included.

Original-Bug: 84869
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/643821
Original-Revision: 4b432fe21011617ffaaf7bbc5268a2062ffb9200
GitOrigin-RevId: 29ff38d81be482469524171e0e93d394836d3783
Change-Id: Iac515a430744574f74966bfd9e6f23f37459b53f
diff --git a/stem b/stem
index 0f5b738..c54d9c0 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="5e6b0a19f753e5e6637cde82aa66cf3dd33d5d9a"/>
+             revision="4b432fe21011617ffaaf7bbc5268a2062ffb9200"/>
   </projects>
   <hooks>
     <hook name="install-environment"