Build(deps): bump phpstan/phpstan from 0.12.87 to 0.12.89 in /dev-tools

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.12.87 to 0.12.89.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.87...0.12.89)

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

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

dev-tools/composer.json

@@ -8,7 +8,7 @@
         "maglnet/composer-require-checker": "^3.2.0",
         "mi-schi/phpmd-extension": "^4.3.0",
         "phpmd/phpmd": "^2.10.1",
-        "phpstan/phpstan": "^0.12.87",
+        "phpstan/phpstan": "^0.12.89",
         "phpstan/phpstan-strict-rules": "^0.12.9",
         "squizlabs/php_codesniffer": "^3.6.0",
         "vimeo/psalm": "^4.7.2"