Bump phpstan/phpstan-phpunit from 0.12.19 to 0.12.20
Bump phpstan/phpstan-phpunit from 0.12.19 to 0.12.20

Bumps [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) from 0.12.19 to 0.12.20.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](https://github.com/phpstan/phpstan-phpunit/compare/0.12.19...0.12.20)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
lcobucci/di-builder