[roll] Roll fuchsia [fxfs] Cache extended attr records

A fair bit of time is spent serializing/deserializing these records
via get/set_extended_attributes during normal usages (booting), and
these are trivially cacheable.

Original-Bug: 323571978
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/995687
Original-Revision: 20a7e5ccac17f458c205887e0c8244ca0d2d8fff
GitOrigin-RevId: bc56ea19b9f2bb0f21439d73fb42fe1832af1e6c
Change-Id: Id6994a392c4a2183201189ee74190ff16e73684c
diff --git a/stem b/stem
index 7dc719c..b955083 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="1c6365cf224ae99424065441aad2fb8e8ecacf44"/>
+             revision="20a7e5ccac17f458c205887e0c8244ca0d2d8fff"/>
   </projects>
   <hooks>
     <hook name="install-environment"