[roll] Roll fuchsia [fidl][rust_next] derive Default for tables

This is useful (in GIDL and elsewhere) so that you can create a table
only specifying the values for present members.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1249268
Original-Revision: 8ffaf016854ad273068754d6c68916c32ebd870b
GitOrigin-RevId: dd76db005eabd7da476b95c5840aecbdab8a5d9e
Change-Id: Ibcb5df1be8f4b6c47ebbc05f8e00fae3a3e94018
diff --git a/stem b/stem
index 9b4bd3d..2a5650a 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="d0893b5c0cd7130ad4575c32429a551321fe02be"
+             revision="8ffaf016854ad273068754d6c68916c32ebd870b"
              />
   </projects>
   <hooks>