[roll] Roll fuchsia [build] Fix hermeticity of python actions

... by adding all transitively imported library scripts to their
sources/inputs.

This keeps python dependencies statically encoded in GN files, and adds
no extra overhead to our build. The current situation of python script
dependency in our build is fairly simple, which makes this approach
fairly low-effort.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/494239
Original-Revision: 5d1e46dcd5efec03cc0ab8cc8f0ea379f87697c7
GitOrigin-RevId: cd9ba780ab1e6c289bd1ce8a6d626314a4382345
Change-Id: I9e82092a92e81e3ec8f3e7194af9726947da11c6
diff --git a/stem b/stem
index 873580d..d946c7b 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="dac4f2763c62eeec0fdb9331fcb830feaccaf215"/>
+             revision="5d1e46dcd5efec03cc0ab8cc8f0ea379f87697c7"/>
   </projects>
   <hooks>
     <hook name="install-environment"