Aurora Serverless Engine Version Fix

[jasonscalia]

Describe the bug

the aurora engine version specified in variables.tf is not available:

variable "aurora_engine_version" {
  description = "Version of Amazon Aurora Postgres Serverless v1. Verify availability in your region here - https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Concepts.AuroraFeaturesRegionsDBEngines.grids.html#Concepts.Aurora_Fea_Regions_DB-eng.Feature.Serverless"
  type        = string
  default     = "13.4"
}```

### Expected Behavior

The latest version available in Aurora Serverless is 10.12 as per https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Concepts.AuroraFeaturesRegionsDBEngines.grids.html#Concepts.Aurora_Fea_Regions_DB-eng.Feature.Serverless

### Steps to Reproduce

N/A

### Possible Solution

Set default variable to `10.12`

### Provider and CloudQuery version

[cloudquery@cq-dev ~]$ ./cloudquery version Version: 0.19.0 Commit: feadfa6746827cb975797f1f2ba70b5aa1f9643a Date: 2022-01-21 20:31:56.181717202 +0000 UTC m=+0.013789736

### Additional Context

_No response_

[sotolucas]

Hey @jasonscalia, even changing engine version you'll still get an error because CloudQuery only supports PSQL >11.

Unfortunatelly I don't see any solution but changing the database definition in favour of a standard RDS instance.