Update phpstan/phpstan requirement from 2.2.8 to 2.2.9 (#105)

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan-phar-composer-source) to permit the latest version.
- [Commits](https://github.com/phpstan/phpstan-phar-composer-source/commits)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.2.9
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -40,7 +40,7 @@
         "phpspec/prophecy": "^1.18",
         "phpspec/prophecy-phpunit": "^2.0",
         "phpstan/extension-installer": "^1.4",
-        "phpstan/phpstan": "2.2.8",
+        "phpstan/phpstan": "2.2.9",
         "phpstan/phpstan-phpunit": "2.0.18",
         "phpunit/phpunit": "^10 || ^11 || ^12",
         "psalm/plugin-phpunit": "0.19.3",