v2.1.0

feat: Add `response_completion_timeout` support Jakub Wądołowski (@jwadolowski) (#369)

## what

• Add support for response_completion_timeout argument (announced by AWS in July 2025 and implemented in the 6.13.0 version of the AWS provider)
• Bump the minimum provider version to >= 6.13.0

why

Allows configuring response_completion_timeout for CloudFront origins.

references

• https://aws.amazon.com/about-aws/whats-new/2025/07/amazon-cloudfront-origin-response-timeout-controls/
• https://github.com/hashicorp/terraform-provider-aws/blob/main/CHANGELOG.md#6130-september-11-2025
• corresponding PR: cloudposse/terraform-aws-cloudfront-cdn#159