Bump guzzlehttp/guzzle from 7.2.0 to 7.3.0 (#160)

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 7.2.0 to 7.3.0.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/master/CHANGELOG.md)
- [Commits](guzzle/guzzle@7.2.0...7.3.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>