[roll] Roll fuchsia [media] Work around static_assert limitations

After llvm/llvm-project#113885 clang will now
correctly diagnose the use of nullptr in constexpr contexts. Instead,
we can rewrite the check with std::extent_v.

Original-Bug: 381885679
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1166981
Original-Revision: 6e83c9357c23aeb49d6808fc84472894ac1ca671
GitOrigin-RevId: 9e5bf26c76114bd573166508f37ace410362a42c
Change-Id: I4027a3c538c4077b812665701d4080c095a8b01c

Author: Paul Kirth

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="50b17080b13a823cd31e62060d77f62ac2fa7069"/>
+             revision="6e83c9357c23aeb49d6808fc84472894ac1ca671"/>
   </projects>
   <hooks>
     <hook name="install-environment"