composer(deps-dev): bump phpunit/phpunit from 10.3.5 to 10.4.0

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 10.3.5 to 10.4.0.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.4.0/ChangeLog-10.4.md)
- [Commits](sebastianbergmann/phpunit@10.3.5...10.4.0)

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

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