fix: Fix destruction failure when talking to EKS endpoint on private network

[b2cbre]

PR o'clock

Description

In #812 we have a situation where when one attempts to terraform destroy and cluster_endpoint_public_access is false then an error will be encountered:
Error: Get https://SNIP.eks.amazonaws.com/api/v1/namespaces/kube-system/configmaps/aws-auth: dial tcp IP:443: i/o timeout (IP:443 is the IP of the endpoint).

This change has been tested with cluster_endpoint_public_access as true and as false. I tested it by running tf apply && tf destroy in each case, verifying that it completed.

Resolves #812

Checklist

• CI tests are passing
• README.md has been updated after any changes to variables and outputs. See https://github.com/terraform-aws-modules/terraform-aws-eks/#doc-generation

[b2cbre]

README.md has been updated after any changes to variables and outputs.
Is there anything to update in the README?

[github-actions]

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