[roll] Roll fuchsia [netstack3] underscore unused fields

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/582862
Original-Revision: 6337c9b8943594357ec6a88c026668b12d3ecb6f
GitOrigin-RevId: 87d89c78b98d087dc20d507cd8a96d15fc55de26
Change-Id: I60a53df692847bc2c612158a2af4e2ccef508648
diff --git a/stem b/stem
index 4ea0fc2..6bb74fd 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f6db9b6cad94afd90a38316e6726b8aa0e30b21a"/>
+             revision="6337c9b8943594357ec6a88c026668b12d3ecb6f"/>
   </projects>
   <hooks>
     <hook name="install-environment"