Acceptance Criteria (Required on creation):

• Amazon Aurora Postgres 9.6 is no longer tested in our pipeline-based CI
• It is removed from the docs as a supported environment

Hints (optional):

• Aurora Postgres 9.6 reaches end of life by end of January 2022: https://aws.amazon.com/about-aws/whats-new/2021/06/amazon-aurora-supports-postgresql-12-6-11-11-10-16-and-9-6-21/?nc1=h_ls