Bump phpunit/phpunit in the minor-version-updates group (#625)

Bumps the minor-version-updates group with 1 update: [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit).


Updates `phpunit/phpunit` from 12.3.15 to 12.4.0
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/12.4.0/ChangeLog-12.4.md)
- [Commits](sebastianbergmann/phpunit@12.3.15...12.4.0)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: minor-version-updates
...

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

Author: dependabot[bot]