r/aws_route: NAT Gateway targets support IPv6 destinations

[ewbankkit]

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Closes #23413.

Output from acceptance testing:

% make testacc TESTS=TestAccEC2Route_ipv6ToNatGateway PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2Route_ipv6ToNatGateway'  -timeout 180m
=== RUN   TestAccEC2Route_ipv6ToNatGateway
=== PAUSE TestAccEC2Route_ipv6ToNatGateway
=== CONT  TestAccEC2Route_ipv6ToNatGateway
--- PASS: TestAccEC2Route_ipv6ToNatGateway (191.08s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	195.021s

[YakDriver]

🎉

% make testacc TESTS=TestAccEC2Route_ipv6ToNatGateway PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccEC2Route_ipv6ToNatGateway'  -timeout 180m
=== RUN   TestAccEC2Route_ipv6ToNatGateway
=== PAUSE TestAccEC2Route_ipv6ToNatGateway
=== CONT  TestAccEC2Route_ipv6ToNatGateway
--- PASS: TestAccEC2Route_ipv6ToNatGateway (245.79s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	247.459s

[github-actions]

This functionality has been released in v4.4.0 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!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.