Reference to a potentially unmaintained project (mhausenblas/rbac.dev)

The project [mhausenblas/rbac.dev](https://github.com/mhausenblas/rbac.dev) has not been pushed to since 2022-07-05. Please check if the project is still maintained.

Start by checking the current maintenance status of mhausenblas/rbac.dev at the linked GitHub project. Then locate its reference in the aws-eks-best-practices guide; the work is done when the status is verified and the documentation reflects the result.

Written by the indexing model from the issue text.