Build(deps-dev): Bump php-http/discovery from 1.17.0 to 1.18.0

Bumps [php-http/discovery](https://github.com/php-http/discovery) from 1.17.0 to 1.18.0.
- [Release notes](https://github.com/php-http/discovery/releases)
- [Changelog](https://github.com/php-http/discovery/blob/1.x/CHANGELOG.md)
- [Commits](php-http/discovery@1.17.0...1.18.0)

---
updated-dependencies:
- dependency-name: php-http/discovery
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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