Bump guzzlehttp/psr7 from 1.5.2 to 1.6.0
Bump guzzlehttp/psr7 from 1.5.2 to 1.6.0

Bumps [guzzlehttp/psr7](https://github.com/guzzle/psr7) from 1.5.2 to 1.6.0.
- [Release notes](https://github.com/guzzle/psr7/releases)
- [Changelog](https://github.com/guzzle/psr7/blob/master/CHANGELOG.md)
- [Commits](https://github.com/guzzle/psr7/compare/1.5.2...1.6.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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