[roll] Roll fuchsia [build] move README to reflect install-move

Duplicating from old location under
tools/check-licenses/assets/readmes/prebuilt/third_party
(which will be deleted as a follow-up to complete the move).

This is needed to unblock the manifest change in integration.

Original-Bug: 412392273
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1261664
Original-Revision: e9ca9054c18b7a50eac2e813e10f2456544f91b6
GitOrigin-RevId: ba8c9ad4f3b2f4fb961dffd1b0bbd7464a7c21bb
Change-Id: Ib552d646758568213e1abbdd1e6c2036e754e399
diff --git a/stem b/stem
index 7336393..7666c00 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="040a72f19af44f35801cec5a87e1eea8b6266456"
+             revision="e9ca9054c18b7a50eac2e813e10f2456544f91b6"
              />
   </imports>
 </manifest>