Ensure automatic minor version upgrade is enabled for Amazon Relational Database Service (Amazon RDS) instances

AWS RDS instances have auto minor version upgrade disabled which may cause RDS instances to miss important updates and bug fixes.

In AWS Console -

1. Sign in to the AWS Console and go to the AWS RDS Console.
2. In the RDS Dashboard, click on Databases.
3. Select Modify to modify the instance of your choice.
4. Select the Auto Minor Version Upgrade option to enable it.

In Terraform -

1. In the aws_db_instance resource, set the auto_minor_version_upgrade field to true.

References:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.Upgrading.html#USER_UpgradeDBInstance.Upgrading.AutoMinorVersionUpgrades
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/db_instance#auto_minor_version_upgrade