#251 Upgrade PostGIS JDBC driver to 2021.1.0

[Mark]

dbUnit relies on old release of PostGIS JDBC driver, that has not been declared as a dependency; also an old version of the PostgrSQL driver is defined as an optional dependency

The PostGIS JDBC project released 2021.1.0 on Aug 5 of this year and has changed the package names to become properly modular, see https://github.com/postgis/postgis-java/releases/tag/v2021.1.0

dbUnit should use the new net.postgis.PGgeometry

[Mark]

error on using net.postgis.PGgeometry above, that should be net.postgis.jdbc.PGgeometry

Adding a patch that:
- updates the PostgreSQL driver to the current release
- add the (updated) PostGIS driver as an optional dependency
- updates the PostgreSQL docker image to a supported release

[Mark]

Hey @jeffjensen
Any input or comments on this patch?

[Jeff Jensen]

Thank you Mark!
2.7.3-SNAPSHOT deployed to Sonatype OSS for testing.

https://gitlab.com/dbUnit/dbunit-extension/-/pipelines/455424178