[roll] Roll fuchsia [bt][fidl] Add size bounds to AdvertisingData fields.

AdvertisingData is encoded for the Bluetooth protocol as a length byte
followed by field data. As such, each field's length when encoded must
fit in a single byte (i.e. be <= 255).

Original-Bug: 66980
Test: FIDL bounds-checking change only.
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/466217
Original-Revision: 788f537577cb1d52381fe91c396e8716d9086257
GitOrigin-RevId: 0c29ffc2c302041dab3f176b625306dec2bd39fd
Change-Id: I78d8a94aac4755203dcf58a46e5b5492fa235a64
diff --git a/stem b/stem
index 69706ab..8981dba 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8df0b7f427c27d50a0ac4625be87552cfd3b5fbb"/>
+             revision="788f537577cb1d52381fe91c396e8716d9086257"/>
   </projects>
   <hooks>
     <hook name="install-fx"