eks_cluster: Export ipv6 service address range

[mattburgess]

Closes #23308

Output from acceptance testing:

$ make testacc TESTS=TestAccXXX PKG=ec2

...

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccEKSClusterDataSource_basic' PKG=eks
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/eks/... -v -count 1 -parallel 20  -run=TestAccEKSClusterDataSource_basic -timeout 180m
=== RUN   TestAccEKSClusterDataSource_basic
=== PAUSE TestAccEKSClusterDataSource_basic
=== CONT  TestAccEKSClusterDataSource_basic
--- PASS: TestAccEKSClusterDataSource_basic (759.66s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/eks	765.579s

[ewbankkit]

@mattburgess Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.34.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

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