Bump aws/aws-sdk-php from 3.323.2 to 3.368.0 in /php/example_code

Bumps [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) from 3.323.2 to 3.368.0.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Commits](aws/aws-sdk-php@3.323.2...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] <[email protected]>

Author: dependabot[bot]