Update Terraform terraform-aws-modules/vpc/aws to v5.1.1

[staff-infrastructure-moj]

This PR contains the following updates:

Package	Type	Update	Change
terraform-aws-modules/vpc/aws (source)	module	patch	5.1.0 -> 5.1.1

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Release Notes

terraform-aws-modules/terraform-aws-vpc (terraform-aws-modules/vpc/aws)

### [`v5.1.1`](https://togithub.com/terraform-aws-modules/terraform-aws-vpc/blob/HEAD/CHANGELOG.md#511-2023-07-25) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-vpc/compare/v5.1.0...v5.1.1)

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