[roll] Roll fuchsia [llcpp] LLCPP V2 async client + server decoding support

A previous CL added support for decoding the V2 wireformat for responses
sent to sync clients. This CL covers all other paths in LLCPP.

Original-Bug: 79578

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/564022
Original-Revision: b88daecc9423017b298ac7bb054b9a470241d7e1
GitOrigin-RevId: 7bd50dd2ec72e50391b43534b6ad4957fb85beb1
Change-Id: Ibc5a3d46a7d064f38f3ff495a022772efb75750f
diff --git a/stem b/stem
index 7674dc3..7f07fa9 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="3e7aaacff55281559766a425a8cfc39ec82fd741"/>
+             revision="b88daecc9423017b298ac7bb054b9a470241d7e1"/>
   </projects>
   <hooks>
     <hook name="install-environment"