Latest version of com.google.api:gax-grpc
https://javadoc.io/doc/com.google.api/gax-grpc
Current version 2.6.0
https://javadoc.io/doc/com.google.api/gax-grpc/2.6.0
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.api/gax-grpc/2.6.0/package-list