Next-gen PostgreSQL convenience image

What’s New

The new PostgreSQL convenience image (cimg/postgres) is now generally available. This image replaces the soon-to-be deprecated legacy image (circleci/postgres).

• Refer to the following CircleCI Discuss post for more information about this update, which can be found here.
• You may also find more information about this release in the following CircleCI GitHub repository, which can be found here.