[roll] Roll fuchsia [network/test] Update IPv6 reassembly expects

Now that we ignore duplicate IPv6 fragments (https://fxrev.dev/1261544)
cases 8.1 of the ipv6 and ipv6-router conformance test suites are
passing.

Original-Bug: 414373926
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1263884
Original-Revision: b2ba04fcc004e61be50ee7646eb3c8ef92059b5f
GitOrigin-RevId: b47517aa0fff06c5d01f4b4d39fbcfa7b107443d
Change-Id: Ie7c2e7408cad5370cba44dc332b007bf93649fac
diff --git a/stem b/stem
index 988c459..94b79cc 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f1a7afddf188fdd7026335682683c81245fb46fd"
+             revision="b2ba04fcc004e61be50ee7646eb3c8ef92059b5f"
              />
   </imports>
 </manifest>