[roll] Roll fuchsia [fshost] Fix a flake

For real, this time. I think the issue might be that the block driver
gets bound after the partition appears and there's a window where it
doesn't exist. To fix this, we can use recursive_wait_and_open.

Original-Fixed: 317381840
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/966452
Original-Revision: a6e6c62fd2133296121ffd68e5782bccc8fa07a7
GitOrigin-RevId: f3c20e87b48b0b2fd04532d0fc9891845f7c8ecd
Change-Id: I5d7bb0dff4b07f39b465b6089297850c72bc217b
diff --git a/stem b/stem
index 8d87add..4564e1b 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="90cc1f04ab394aafba004e75117205e268bca840"/>
+             revision="a6e6c62fd2133296121ffd68e5782bccc8fa07a7"/>
   </projects>
   <hooks>
     <hook name="install-environment"