[roll] Roll fuchsia [component_manager] add FIDL to get own sandbox

Adds a new FIDL API for a framework protocol that can be used to get a
component's own sandbox.

As this is not yet ready for wide consumption, the implementation of the
protocol checks that the component accessing the protocol is a builtin
component. In other words, component manager is currently the only
allowed consumer of this protocol.

Original-Fixed: 415968285
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1269704
Original-Revision: 929585add9331d52a387ea69d1f7093bd84416b2
GitOrigin-RevId: 9ddccb0681ffe1faeda24907af356e0e515349c6
Change-Id: Ia013e2b53ef0d2bd8b70bc15ca99507a211937ec
diff --git a/stem b/stem
index 0e73a1a..104abd7 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8e27b17081b8b21b7192ac262f0230d9b92ab88c"
+             revision="929585add9331d52a387ea69d1f7093bd84416b2"
              />
   </imports>
   <projects>