Restrict the ability to upload patch sets to other people's changes. Bug: b/375065394 Change-Id: I1dc0eef1f2abe958757001548f4ae6e08b6251df Reviewed-on: https://boringssl-review.googlesource.com/c/All-Projects/+/72347 Auto-Submit: Bob Beck <bbe@google.com> Reviewed-by: Bob Beck <bbe@google.com> Commit-Queue: Bob Beck <bbe@google.com>