Build(deps-dev): Bump guzzlehttp/psr7 from 2.5.0 to 2.6.0

Bumps [guzzlehttp/psr7](https://github.com/guzzle/psr7) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/guzzle/psr7/releases)
- [Changelog](https://github.com/guzzle/psr7/blob/2.6/CHANGELOG.md)
- [Commits](guzzle/psr7@2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: guzzlehttp/psr7
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>