* update driver
remove connection closure when not required
* add connection pool
remove ssl options
* got working with postgres driver
* use Redshift driver instead of postgres
* updated JUnit TC
added comments
minor refactor
* add comment
cleanup
* update default port
Maven 3.8 now blocks HTTP repositories and only allows HTTPS. However, the version redshift jdbc dependency we are using connects to a separate repository that runs on HTTP. The latest version has switched to using HTTPS instead.
So this PR upgrades redshift dependency from version 2.0.0.1 to 2.0.0.4.
Ref: https://maven.apache.org/docs/3.8.1/release-notes.html#cve-2021-26291
