Bump github.com/aws/aws-sdk-go-v2 from 1.19.1 to 1.20.0 in /assets/aws (

gravitational#29923)

Bumps [github.com/aws/aws-sdk-go-v2](https://github.com/aws/aws-sdk-go-v2) from 1.19.1 to 1.20.0.
- [Release notes](https://github.com/aws/aws-sdk-go-v2/releases)
- [Changelog](https://github.com/aws/aws-sdk-go-v2/blob/main/CHANGELOG.md)
- [Commits](aws/aws-sdk-go-v2@v1.19.1...v1.20.0)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go-v2
  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>