[roll] Roll fuchsia [fbl] Alias fbl::AutoCall

fbl::AutoCall becomes an alias of fit::deferred_action, and
fit::MakeAutoCall becomes one of fit::defer. This simplifies the
transition and gives an early vote of confidence that these
abstractions are being used identically.

Original-Bug: 57355
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/509080
Original-Revision: f9a0e5b1285f74c3e359c3c1b1ea9a86bba66ae6
GitOrigin-RevId: 5d5bb52a74f83da8481d20295448f706ab5c1f9a
Change-Id: I6b3e00bd29788e0f879ea7fdcbae31c8755fdd30
diff --git a/stem b/stem
index 1b40573..32dcd4e 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="b4f32b44d8f90d2fd6223aaf8ad75a6e90deb595"/>
+             revision="f9a0e5b1285f74c3e359c3c1b1ea9a86bba66ae6"/>
   </projects>
   <hooks>
     <hook name="install-environment"