[roll] Roll fuchsia [sdk][fidl] Update net.dhcpv6 sdk category to internal

The experimental SDK category is deprecated.

Original-Bug: b/287395493
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/890958
Original-Revision: 4f75cf9d56a95901bb89e2bdbb660cee6dd5cdc8
GitOrigin-RevId: c502c9dd683f543d1709bc3407394497b50ec7d1
Change-Id: Ie53232f6c89a05c4022ff744c24a7d11b6e6f17d
diff --git a/stem b/stem
index 8b5145d..0ebaed5 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="b9ab01f9688505471e09f6e706e2dbedfe2a1788"/>
+             revision="4f75cf9d56a95901bb89e2bdbb660cee6dd5cdc8"/>
   </projects>
   <hooks>
     <hook name="install-environment"