Bump nyholm/psr7 from 1.5.0 to 1.6.1

Bumps [nyholm/psr7](https://github.com/Nyholm/psr7) from 1.5.0 to 1.6.1.
- [Release notes](https://github.com/Nyholm/psr7/releases)
- [Changelog](https://github.com/Nyholm/psr7/blob/master/CHANGELOG.md)
- [Commits](Nyholm/psr7@1.5.0...1.6.1)

---
updated-dependencies:
- dependency-name: nyholm/psr7
  dependency-type: direct:production
...

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