[roll] Roll fuchsia [assembly] Remove old_fvm_blob_sparse_path

It is no longer used. Confirmed with downstream consumers this is OK to
land: http://b/273350865#comment7.

Original-Bug: 82077
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/816647
Original-Revision: 877234c8bbf529d1d22b0d17e988715491cdaa4a
GitOrigin-RevId: 5c5b7f463bdcf05ba7d8fe7dc80a324270157b5a
Change-Id: I9c920d3ee3dda84ddd550c97258e5860afd05fd9

stem

diff --git a/stem b/stem
index f6b6faa..7e984f3 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="39b89f34484dccd6297c997a954652b11ade77e7"/>
+             revision="877234c8bbf529d1d22b0d17e988715491cdaa4a"/>
   </projects>
   <hooks>
     <hook name="install-environment"