(TF): Bump hashicorp/aws in /modules/aws/group_account_assignments (#57)

Bumps [hashicorp/aws](https://github.com/hashicorp/terraform-provider-aws) from 5.44.0 to 5.45.0.
- [Release notes](https://github.com/hashicorp/terraform-provider-aws/releases)
- [Changelog](https://github.com/hashicorp/terraform-provider-aws/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-provider-aws@v5.44.0...v5.45.0)

---
updated-dependencies:
- dependency-name: hashicorp/aws
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dan Palmer <[email protected]>