[roll] Roll fuchsia Revert "[artifactory] Only upload uefi/elf_sizes.json images"

This reverts commit 32dcc9be9aa42b076c46bba5a1e1978083a1021d.

Reason for revert: flash.json is still needed

Original change's description:
> [artifactory] Only upload uefi/elf_sizes.json images
>
> These are the only images we need to upload anymore.
> Don't upload any others to prevent adding new dependencies.
>
> Run-all-tests: true
> Change-Id: If96635e9747fcc7e222b8b419f385dabbc4d85de
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1275191
> Fuchsia-Auto-Submit: Aidan Wolter <awolter@google.com>
> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
> Reviewed-by: Ina Huh <ihuh@google.com>
> Mega-CQ: Aidan Wolter <awolter@google.com>

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1275826
Original-Revision: 69b3547ce21e4b2db4e25fea30ea219546d00f79
GitOrigin-RevId: 3f332c1eaede7ad0369d27293c4faab0248f5264
Change-Id: I1bcf7d13c33da257f28f4e3988a8c7f0b1369d7a
diff --git a/stem b/stem
index 341b19c..aa4a6ba 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f665882651939a9ed110689826bebdb9b45c1ab7"
+             revision="69b3547ce21e4b2db4e25fea30ea219546d00f79"
              />
   </imports>
   <projects>