[roll] Roll fuchsia [factory] Replace POSIX with Block FIDL

Original-Bug: 33822
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/757589
Original-Revision: da43330f9599cf5aa9923c55bf59726e0f1050e6
GitOrigin-RevId: 0314859de4c3e792f70e78687b01560a01eea898
Change-Id: Ib3d4adba470142335d74e208a8bea646c5e2870e
diff --git a/stem b/stem
index d74187e..862b6a4 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="4aecc895b1722972f4ba1f170dd04a18f85e6477"/>
+             revision="da43330f9599cf5aa9923c55bf59726e0f1050e6"/>
   </projects>
   <hooks>
     <hook name="install-environment"