build(deps-dev): bump phpunit/phpunit from 11.5.21 to 11.5.50 (#1174)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 11.5.21 to 11.5.50.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.5.50/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@11.5.21...11.5.50)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 11.5.50
  dependency-type: direct:development
...

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

Author: dependabot[bot]