It looks like this attribute was removed in commit ffbce32f931a9b33adc8407a267ba176c510bd44. Per the docs this would allow us to flip to HTTPS in private integrations (https://docs.aws.amazon.com/apigatewayv2/latest/api-reference/apis-apiid-integrations-integrationid.html).
# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key.
Opened https://github.com/terraform-providers/terraform-provider-aws/pull/13013 to fix this.
This has been released in version 3.0.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.
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Opened https://github.com/terraform-providers/terraform-provider-aws/pull/13013 to fix this.