[roll] Roll fuchsia [component_manager] Remove Router path field

This CL simplifies the Router type by removing the path field.
This has the nice property that calling Route will always return the
same type of capability.

This prevents the error-case of using a path field to index into
a Sender/Receiver.

Instead of feeding the path forward, the code has been updated
to call Route, check the capability that was returned, and then
index into that capability.

Original-Fixed: b/325096862
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/993133
Original-Revision: 4ae3cfcaf2492a95835e201390e33b53199f3fc7
GitOrigin-RevId: 2d4b0bc16f95e92964d46d90eb9ddce15bb6f22b
Change-Id: I950563a4e331c04c45c4595763a8260c11f39ef3
diff --git a/stem b/stem
index c954a5f..2f0d649 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="978aceabb565490cd237c165ff4c0ebbbe9ff3d1"/>
+             revision="4ae3cfcaf2492a95835e201390e33b53199f3fc7"/>
   </projects>
   <hooks>
     <hook name="install-environment"