[roll] Roll fuchsia [magma] Use scheduler SDK library to set roles

Switches the magma library to use the scheduler SDK library to set
profiles on threads instead of connecting to the ProfileProvider
directly. This will allow the future transition to using the RoleManager
API much easier.

Original-Bug: 323262398
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/988782
Original-Revision: 75ec70ab79bc5919c89ee2391ada024b8431a195
GitOrigin-RevId: e1ef69e51e47b02dca607e817b928adf442be036
Change-Id: Ie562d812bb89e16328c945c883f1b9544ddf0b4e
diff --git a/stem b/stem
index c848500..913dbb5 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="e407aa729627cf00edf5fb4db371e9276279c73f"/>
+             revision="75ec70ab79bc5919c89ee2391ada024b8431a195"/>
   </projects>
   <hooks>
     <hook name="install-environment"