Add janitors to the OWNERS file am: e059e5301a

Original change: https://android-review.googlesource.com/c/platform/external/golang-protobuf/+/3423759

Change-Id: Idc836b6c7070d527acdc9cdb28d237c01c5eaf9d
Signed-off-by: Automerger Merge Worker <[email protected]>