build(deps-dev): bump phpunit/phpunit from 9.5.4 to 9.5.5 (#8)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.5.4 to 9.5.5.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.4...9.5.5)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>