[java-client][google-api-client] version update?

Created by: jmini

When a Java client is generated using the google-api-client library, then the version used is quite old:

https://github.com/OpenAPITools/openapi-generator/blob/123efc5d651938d7c077fbbb057a3e4d64da5a73/samples/client/petstore/java/google-api-client/pom.xml#L254

Any reason why we are not using something newer?

        <google-api-client-version>1.30.2</google-api-client-version>

Version 1.23.0 is from "Oct, 2017" https://mvnrepository.com/artifact/com.google.api-client/google-api-client