build(deps-dev): Bump phpunit/phpunit

Bumps the dependencies group with 1 update in the /composer-root-version-checker directory: [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit).


Updates `phpunit/phpunit` from 11.2.5 to 11.2.8
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.2.8/ChangeLog-11.2.md)
- [Commits](sebastianbergmann/phpunit@11.2.5...11.2.8)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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