build(deps): bump hashicorp/aws in /_example/on-demand

Bumps [hashicorp/aws](https://github.com/hashicorp/terraform-provider-aws) from 5.21.0 to 5.23.1.
- [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@v5.21.0...v5.23.1)

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

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