development-nightly-2026-05-14

build(deps-dev): bump phpunit/phpunit from 13.1.8 to 13.1.9

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 13.1.8 to 13.1.9.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/13.1.9/ChangeLog-13.1.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/13.1.8...13.1.9)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 13.1.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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