feat(tf): update terragrunt dependency github.com/terraform-aws-modules/terraform-aws-eks to v20.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/terraform-aws-modules/terraform-aws-eks	github	minor	v20.11.1 -> v20.12.0

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Release Notes

terraform-aws-modules/terraform-aws-eks (github.com/terraform-aws-modules/terraform-aws-eks)

### [`v20.12.0`](https://togithub.com/terraform-aws-modules/terraform-aws-eks/releases/tag/v20.12.0) [Compare Source](https://togithub.com/terraform-aws-modules/terraform-aws-eks/compare/v20.11.1...v20.12.0) ##### Features - Support additional cluster DNS IPs with Bottlerocket based AMIs ([#​3051](https://togithub.com/terraform-aws-modules/terraform-aws-eks/issues/3051)) ([541dbb2](https://togithub.com/terraform-aws-modules/terraform-aws-eks/commit/541dbb29f12bb763a34b32acdaea9cea12d7f543))

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Configuration

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