Bump slim/psr7 from 0.5.0 to 0.6
Bump slim/psr7 from 0.5.0 to 0.6

Bumps [slim/psr7](https://github.com/slimphp/Slim-Psr7) from 0.5.0 to 0.6.
- [Release notes](https://github.com/slimphp/Slim-Psr7/releases)
- [Commits](https://github.com/slimphp/Slim-Psr7/compare/0.5.0...0.6)

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