chore(deps): bump mtdowling/jmespath.php in /php/example_code/rds

Bumps [mtdowling/jmespath.php](https://github.com/jmespath/jmespath.php) from 2.8.0 to 2.9.2.
- [Release notes](https://github.com/jmespath/jmespath.php/releases)
- [Changelog](https://github.com/jmespath/jmespath.php/blob/master/CHANGELOG.md)
- [Commits](jmespath/jmespath.php@2.8.0...2.9.2)

---
updated-dependencies:
- dependency-name: mtdowling/jmespath.php
  dependency-version: 2.9.2
  dependency-type: indirect
...

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Author: dependabot[bot]