Bump phpspec/prophecy-phpunit in the minor-composer-dependencies group

Bumps the minor-composer-dependencies group with 1 update: [phpspec/prophecy-phpunit](https://github.com/phpspec/prophecy-phpunit).


Updates `phpspec/prophecy-phpunit` from 2.2.0 to 2.3.0
- [Release notes](https://github.com/phpspec/prophecy-phpunit/releases)
- [Changelog](https://github.com/phpspec/prophecy-phpunit/blob/master/CHANGES.md)
- [Commits](phpspec/prophecy-phpunit@v2.2.0...v2.3.0)

---
updated-dependencies:
- dependency-name: phpspec/prophecy-phpunit
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor-composer-dependencies
...

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