Update Terraform terraform-aws-modules/rds/aws to v4.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terraform-aws-modules/rds/aws (source)	module	minor	4.2.0 -> 4.3.0

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Release Notes

terraform-aws-modules/terraform-aws-rds

### [`v4.3.0`](https://togithub.com/terraform-aws-modules/terraform-aws-rds/blob/HEAD/CHANGELOG.md#​430-httpsgithubcomterraform-aws-modulesterraform-aws-rdscomparev420v430-2022-04-27) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-rds/compare/v4.2.0...v4.3.0) ##### Features - Support `source_db_instance_automated_backups_arn` parameter in `restore_to_point_in_time` block ([#​398](https://togithub.com/terraform-aws-modules/terraform-aws-rds/issues/398)) ([559e6b1](https://togithub.com/terraform-aws-modules/terraform-aws-rds/commit/559e6b11b76b428e8752e094366c36bea2c2c298))

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