build(deps-dev): update phpstan/phpstan requirement

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.0.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.11.5...1.12.5)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -13,7 +13,7 @@
         "doctrine/event-manager": "^2.0",
         "editorconfig-checker/editorconfig-checker": "^10.6.0",
         "ergebnis/composer-normalize": "^2.43.0",
-        "phpstan/phpstan": "^1.11.5",
+        "phpstan/phpstan": "^1.12.5",
         "phpstan/phpstan-phpunit": "^1.4.0",
         "phpstan/phpstan-strict-rules": "^1.6.0",
         "phpunit/phpunit": "^10.5.24",