chore(deps-dev): bump phpunit/phpunit from 8.5.3 to 8.5.4

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 8.5.3 to 8.5.4.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.5.md)
- [Commits](sebastianbergmann/phpunit@8.5.3...8.5.4)

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