Bump guzzlehttp/guzzle from 7.4.2 to 7.4.3 in /generator

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 7.4.2 to 7.4.3.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/master/CHANGELOG.md)
- [Commits](guzzle/guzzle@7.4.2...7.4.3)

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

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