[roll] Roll fuchsia [fidl] Separate out DirectoryAdmin into its own library.

This interface is not used outside of the main Fuchsia repository and
separating it out into a non-distributed interface will allow more
flexibility to change it going forward.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/582468
Original-Revision: db215d4621cda6044cb68e229c175162fe71b0b5
GitOrigin-RevId: ee0610cede46266c36f3a124d3ac9ccdd86cd114
Change-Id: Ie94f5aaabe6b66b852067821d5a111ddfdebb83e
diff --git a/stem b/stem
index 3c3a672..18eee93 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="bace9127b5f769ccfc8a80e355c8f3020ede4df8"/>
+             revision="db215d4621cda6044cb68e229c175162fe71b0b5"/>
   </projects>
   <hooks>
     <hook name="install-environment"