Restrict access to release branch: release-R121 to LTS Refresher group.

BUG=b/475291916

Change-Id: Ib9de31ac6a15148a40f12e46b1171bc9745fd073
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/129701
Tested-by: Dom Huh <domhuh@google.com>
Reviewed-by: Kevin Liu <zhihuil@google.com>
2 files changed