[roll] Roll fuchsia Revert "[ffx] Change ffx_config::get() to not be async"

This reverts commit 0844e358d4e0fb79a2cb01e9807f0a42d6278eb7.

Reason for revert: suspected to be causing host_x64/ffx_repository_packages_lib_test failures

Original change's description:
> [ffx] Change ffx_config::get() to not be async
>
> In preparation for changing ffx to use read-only configs, this
> CL changes config to use a `std::sync::RwLock` instead of an
> `async_lock::RwLock`. This won't cause problems since
> ffx is single-threaded and won't run into asynchronous lock
> issues.
>
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1057902

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1058557
Original-Revision: cd67bed1d3f9e1019e53ba315e0f80aae76e9a71
GitOrigin-RevId: d2932c035882ec97f22dc5b8d65aa3d5277df96d
Change-Id: I3e8ed2ddabfd3b57c456a55196d2c918988aa77a
diff --git a/stem b/stem
index fec3637..755a8db 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="f5e1fa92d4117311e40f44c14bbc2f6acdfdac1b"/>
+             revision="cd67bed1d3f9e1019e53ba315e0f80aae76e9a71"/>
   </projects>
   <hooks>
     <hook name="install-environment"