Bumps [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) from 1.28.5 to 1.28.9.
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Changelog](https://github.com/aws/aws-sdk-go/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-go/compare/v1.28.5...v1.28.9)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>