Bump phpunit/phpunit from 9.6.20 to 11.5.4

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.20 to 11.5.4.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.5.4/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.20...11.5.4)

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

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