[roll] Roll fuchsia [kernel][vm] Use paged backlink helper

Use the helper to avoid needing an `AssertHeld`

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1219605
Original-Revision: 62fa8ad7663d7a874b007c6edb674c72a82b75f1
GitOrigin-RevId: 82cfd20382bc1259ac0337aab545bf61d788fb06
Change-Id: I3c470225e524d35a25807078da7202e2fcb189db
diff --git a/stem b/stem
index ecb3fa1..d364b34 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="8f80aafe4f01faf5b360b11ca8bb2c9d762bcbec"/>
+             revision="62fa8ad7663d7a874b007c6edb674c72a82b75f1"/>
   </projects>
   <hooks>
     <hook name="install-environment"