Latest version of com.google.api.grpc:proto-google-cloud-spanner-admin-database-v1
https://javadoc.io/doc/com.google.api.grpc/proto-google-cloud-spanner-admin-database-v1
Current version 6.9.0
https://javadoc.io/doc/com.google.api.grpc/proto-google-cloud-spanner-admin-database-v1/6.9.0
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.api.grpc/proto-google-cloud-spanner-admin-database-v1/6.9.0/package-list