Bump guzzlehttp/guzzle in /modules/devshop/aegir_cloud/providers/packet

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 5.3.0 to 5.3.4.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/5.3.4/CHANGELOG.md)
- [Commits](guzzle/guzzle@5.3.0...5.3.4)

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

Signed-off-by: dependabot[bot] <[email protected]>