Add support for RDS IAM credentials (cyrilgdn#134)

Author: Jell

go.mod

@@ -3,6 +3,9 @@ module github.com/terraform-providers/terraform-provider-postgresql
 go 1.17
 
 require (
+	github.com/aws/aws-sdk-go-v2 v1.9.0
+	github.com/aws/aws-sdk-go-v2/config v1.8.0
+	github.com/aws/aws-sdk-go-v2/feature/rds/auth v1.1.6
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.10.1
 	github.com/lib/pq v1.9.0