Bump aws-sdk from 2.555.0 to 2.556.0

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.555.0 to 2.556.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-js@v2.555.0...v2.556.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>