[roll] Roll fuchsia [wlan][policy] Pass in roam sender to roam monitor init

Adds the roam mpsc::Sender, which the roam monitor service loop uses to
send roam requests to the client state machine, as an argument in the
`initialize_roam_monitor` method, rather than building it internally.

This allows us to intercept that the Sender for testing.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1155215
Original-Revision: e0242af48b321282661ea6d66296745624519547
GitOrigin-RevId: f5246b1ed4147ae454a0004efe4052c6b0e55e51
Change-Id: I8430ab68610a00c1dd60fba02a111bc0e4c58cda
diff --git a/stem b/stem
index 9de9848..9597ebd 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="e520d81d64f3e9e0b0b398bd04da8f60bbfaea67"/>
+             revision="e0242af48b321282661ea6d66296745624519547"/>
   </projects>
   <hooks>
     <hook name="install-environment"