YugabyteDB Smart JDBC Driver 42.7.3-yb-2

This driver is based on the PostgreSQL driver and forked from https://github.com/pgjdbc/pgjdbc

Also, available on the maven coordinates:

<dependency>
    <groupId>com.yugabyte</groupId>
    <artifactId>jdbc-yugabytedb</artifactId>
    <version>42.7.3-yb-2</version>
</dependency>

Driver documentation link: https://docs.yugabyte.com/latest/integrations/smart-driver/

What's Changed

• Ensure clusterInfoMap does not become empty when external LB is given by @ashetkar in #25

Full Changelog: v42.7.3-yb-1...v42.7.3-yb-2