[roll] Roll fuchsia [starnix] Box ActiveNamespaceNode in MappingName.

Reduces the size of MappingName.

Original-Bug: 392735168

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1210024
Original-Revision: e7d825cf3b00e46ad35fd7b9a7daf2d9d9a52ca0
GitOrigin-RevId: 5f69314826ba22b6341e7a3990310ab3ff115f34
Change-Id: Ic6cc8efa914487406b16f247fcda4b6dfceb2915
diff --git a/stem b/stem
index ef306ca..237b837 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8c266f3b3382d096f773389e7b215048a6c5fca3"
+             revision="e7d825cf3b00e46ad35fd7b9a7daf2d9d9a52ca0"
              />
   </imports>
   <projects>