Bump aws/aws-sdk-php from 3.112.15 to 3.112.28

Bumps [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) from 3.112.15 to 3.112.28.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Changelog](https://github.com/aws/aws-sdk-php/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-php@3.112.15...3.112.28)

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