Update dependency phpstan/phpstan to ^1.12.9

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpstan/phpstan | 1.12.8 | 1.12.9 |

Author: renovate[bot]

composer.json

@@ -14,7 +14,7 @@
         "php": "~8.3.0 || ~8.4.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "^1.12.8",
+        "phpstan/phpstan": "^1.12.9",
         "phpstan/phpstan-phpunit": "^1.4.0",
         "phpstan/phpstan-strict-rules": "^1.6.1",
         "phpunit/phpunit": "^11.4.3",