[roll] Roll fuchsia [fshost] Use correct span methods to access data

Use span::data() instead of span::begin() and span::end() to get
pointers to the underlying data. While the polyfill cpp20::span
implementation returns raw pointers, that's not guaranteed by the C++20
specification. Migrating to use span::data() ensures this code won't be
broken by enabling C++20 in tree.

Original-Bug: 119175
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/787922
Original-Revision: 04f8a3c9579d2ce431ea4f4c6960e84b571100db
GitOrigin-RevId: f1d1b331893210f655bb86825c9e698154702432
Change-Id: I97eb28a7dfdae063c88d34d607195a87ee719605
diff --git a/stem b/stem
index d683ee0..b5cc32a 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="d904ae62e4317e9577616d6c9ddf25d1296dd275"/>
+             revision="04f8a3c9579d2ce431ea4f4c6960e84b571100db"/>
   </projects>
   <hooks>
     <hook name="install-environment"