v4.5.0

Add support for upgrade policy configuration @z0rc (#245)

## what

Add module variable to set aws_eks_cluster's upgrade_policy.

why

I need to be able to downgrade EKS support policy from default "Extedned" to "Standard".

references

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/eks_cluster#upgrade_policy

https://aws.amazon.com/about-aws/whats-new/2024/07/amazon-eks-controls-kubernetes-version-support-policy/

Summary by CodeRabbit

• New Features

  • Introduced a new input parameter upgrade_policy for configuring the support policy of the EKS cluster.
  • Added a new variable zonal_shift_config to the Terraform configuration.

• Documentation

  • Updated README and Terraform documentation to include details about the new upgrade_policy input.
  • Enhanced clarity and comprehensiveness of existing inputs and outputs documentation.
  • Added examples for the upgrade_policy configuration in the fixtures and variable files.

• Bug Fixes

  • Updated default values for existing variables to improve clarity and usability.