chore(deps-dev): bump phpunit/phpunit from 9.1.4 to 9.1.5 (#23)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.1.4 to 9.1.5.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.1.md)
- [Commits](sebastianbergmann/phpunit@9.1.4...9.1.5)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]