Bump aws/aws-sdk-php from 3.323.1 to 3.368.0 in /php/example_code/kms (#7690)

Bumps [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) from 3.323.1 to 3.368.0.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Commits](aws/aws-sdk-php@3.323.1...3.368.0)

---
updated-dependencies:
- dependency-name: aws/aws-sdk-php
  dependency-version: 3.368.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]