chore: release google-cloud-spanner 2.13.0 (googleapis#17967)

chore: release google-cloud-service_management-v1 0.3.8 (googleapis#1…

…7966)

chore: release google-cloud-service_management 1.0.5 (googleapis#17968)

chore: release google-cloud-pubsub-v1 0.8.0 (googleapis#17960)

chore: release google-cloud-notebooks-v1 0.1.0 (googleapis#17961)

chore: release google-cloud-domains-v1 0.1.0 (googleapis#17964)

chore: release google-cloud-dlp-v2 0.10.0 (googleapis#17965)

chore: release google-cloud-bigquery-storage-v1 0.10.1 (googleapis#17963

)

chore: release google-cloud-bigquery-data_transfer-v1 0.5.1 (googleap…

…is#17962)

chore: release google-cloud-optimization 0.1.0 (googleapis#17947)