Latest version of com.google.cloud:google-cloud-spanner
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner
Current version 6.4.4-sp.5
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner/6.4.4-sp.5
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.cloud/google-cloud-spanner/6.4.4-sp.5/package-list