[roll] Roll fuchsia [rust-3p] Update argh to 0.1.8

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/695906
Original-Revision: 9b21a4d250a3257f856cd33a05795bfd648b9a4a
GitOrigin-RevId: d94b3619b9a78c55447130abe1e463da59d10950
Change-Id: Ib39ed4842fb6ba99167a98e5c7ae8740ccfbbf45

stem

diff --git a/stem b/stem
index 8df6166..38e8a15 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="14e478ee676e355a48e75732392b1310f03414e6"/>
+             revision="9b21a4d250a3257f856cd33a05795bfd648b9a4a"/>
   </projects>
   <hooks>
     <hook name="install-environment"