Bump CI version to create arm bins

[yorinasub17]

Description

This bumps the terraform-aws-ci version so that we create arm64 binaries.

This also updates the circleci job to use docker with a smaller instance class, since boilerplate testing doesn't need the machine executor nor a lot of resources.

TODOs

Please ensure all of these TODOs are completed before asking for a review.

• [x] Ensure the branch is named correctly with the issue number. e.g: feature/new-vpc-endpoints-955 or bug/missing-count-param-434.
• [x] Update the docs.
• [x] Keep the changes backward compatible where possible.
• [x] Run the pre-commit checks successfully.
• [x] Run the relevant tests successfully.

[yorinasub17]

See https://github.com/gruntwork-io/boilerplate/releases/tag/v0.4.3-alpha.1 for test build

[yorinasub17]

Thanks for review! Merging now!