Bump guzzlehttp/guzzle from 7.4.1 to 7.4.3 in /php/example_code/iam
Bump guzzlehttp/guzzle from 7.4.1 to 7.4.3 in /php/example_code/iam

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 7.4.1 to 7.4.3.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/master/CHANGELOG.md)
- [Commits](https://github.com/guzzle/guzzle/compare/7.4.1...7.4.3)

---
updated-dependencies:
- dependency-name: guzzlehttp/guzzle
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples