[roll] Roll fuchsia [fuchsia-controller] Decode into fidlgen_python bindings when they're available

As we migrate tests to the new fidlgen_python bindings, we need
fidl._construct to decode into those bindings when they're available.
Otherwise, FIDL messages will decode into the old bindings, and
equality assertions between old and new binding types will unexpectedly
fail.

Original-Bug: 356217589, 355717613
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1244744
Original-Revision: 14e1b5ec03b3483f03ad7fa939eaa352bbe96b0c
GitOrigin-RevId: a087cba6a34da68fb20b5dbef2765f63d575b08c
Change-Id: I7fc248d0370e3383da64c3edaac6b6323316d737
diff --git a/stem b/stem
index 628b756..f89527a 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="b1c82f153b1edc10bab4c0c5486789a7566f92ba"
+             revision="14e1b5ec03b3483f03ad7fa939eaa352bbe96b0c"
              />
   </projects>
   <hooks>