[roll] Roll fuchsia [fuchsia-pkg] Rename CreationManifest to PackageBuildManifest

This patch renames `CreationManifest` to `PackageBuildManifest` to avoid
confusion once we introduce subpackage build manifests.

Original-Fixed: 114899
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/763313
Original-Revision: 6a0c8cbd002b2b826b9e2cd2963bcab2125c7dfc
GitOrigin-RevId: 484f23a85b00543973df9e56fda647fe53a357f5
Change-Id: I14b725e74302ae20d28341dfecec2853a476bf28
diff --git a/stem b/stem
index cd10cb6..6ebc757 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="aac24d087444b7f3a13586bf5b509d7ffc7681e0"/>
+             revision="6a0c8cbd002b2b826b9e2cd2963bcab2125c7dfc"/>
   </projects>
   <hooks>
     <hook name="install-environment"