Bump phpunit/phpunit from 9.5.3 to 9.5.4 (#28)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.5.3 to 9.5.4.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.3...9.5.4)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>