[roll] Roll fuchsia [magma] Remove unused magma_duplicate_handle

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/457701
Original-Revision: 31824a1fec251e9db1d145a6af8d9ee725340967
GitOrigin-RevId: e7ca1ce6fd2ce1c71c2ee5dd9a413a64ed887658
Change-Id: I98addde8738c6c700165c4f2e8ded627dacca08f
diff --git a/stem b/stem
index ce315ca..870dfe1 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="be7de0909a0a51e561cdc59e19346388527c33a2"/>
+             revision="31824a1fec251e9db1d145a6af8d9ee725340967"/>
   </projects>
   <hooks>
     <hook name="install-fx"