Bump phpstan/phpstan from 0.12.84 to 0.12.89 (#116)

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.12.84 to 0.12.89.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.84...0.12.89)

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

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