Bump phpstan/phpstan from 0.12.88 to 0.12.89 in /tools (#133)

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.12.88 to 0.12.89.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.88...0.12.89)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>