[Buildbucket] update OWNERS
[Buildbucket] update OWNERS

Change-Id: I9325682b50480f00947f6e493853a94ffab4a33d
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3408470
Auto-Submit: Chan Li <332b6c56634d0f63001046c664a2370006a02420@chromium.org>
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go