Fix EKS acceptance test Terraform version compatibility

[Surabhi-1605]

Fixes Terraform version compatibility issues in EKS acceptance tests:

• Updated AWS provider from >= 4.0.0to ~> 5.0
• Updated VPC module from 4.0.0 to 5.0.0
• Removed assume_role block to eliminate warnings
• Resolves vpc = true EIP compatibility error

Fixes: EKS acceptance test failures due to Terraform version incompatibility

[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

---

1 out of 2 committers have signed the CLA.

• Surabhi-1605
• Surabhi Singh

---

Surabhi Singh seems not to be a GitHub user.
You need a GitHub account to be able to sign the CLA.
If you have already a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}

[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

---

Surabhi Singh seems not to be a GitHub user.
You need a GitHub account to be able to sign the CLA.
If you have already a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}

[vdinesh4738]

Please update the branch, add change logger and set backport label