Invalid Postgres version. v10.6 is no longer a valid option within AWS RDS

[mswezey23]

│ Error: Error creating DB Instance: InvalidParameterCombination: Cannot find version 10.6 for postgres
│       status code: 400, request id: 0c9a89d8-63ea-4121-9f0f-f30cab6194b0
│ 
│   with module.retool.aws_db_instance.this,
│   on modules/retool_ecs_ec2/main.tf line 138, in resource "aws_db_instance" "this":
│  138: resource "aws_db_instance" "this" {
│ 

Side notes:

• I noticed in the docker-compose that Postgres is set to 11.X. I would suggest standardizing the Postgres versions across deployments
• The docs do not state which versions of Postgres are supported for Retool's onprem installation. Please update the docs to include a support matrix

[jmsalcido]

currently using 14.13 here just in case this is still relevant.