chore(deps): update dependency protobuf to v3.15.5 (#142)
chore(deps): update dependency protobuf to v3.15.5 (#142)

Co-authored-by: Xiaozhen Liu <1b4bb7c804b1d1da654fa277a4e9dda08d4046a5@google.com>
googleapis/proto-breaking-change-detector,googleapis/proto-breaking-change-detector