r/aws_lightsail_instance: Remove ipv6_address

[ewbankkit]

Description

Removes the deprecated ipv6_address attribute.

Relations

Closes #31388.
Relates #17155.

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccLightsailInstance_basic$$' PKG=lightsail
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/lightsail/... -v -count 1 -parallel 20  -run=TestAccLightsailInstance_basic$ -timeout 180m
=== RUN   TestAccLightsailInstance_basic
=== PAUSE TestAccLightsailInstance_basic
=== CONT  TestAccLightsailInstance_basic
--- PASS: TestAccLightsailInstance_basic (98.76s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/lightsail	103.976s

[github-actions]

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[github-actions]

This functionality has been released in v5.0.0 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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