Update dependency phpunit/phpunit to v13

| datasource | package         | from    | to     |
| ---------- | --------------- | ------- | ------ |
| packagist  | phpunit/phpunit | 12.5.17 | 13.1.1 |

Author: renovate[bot]

composer.json

@@ -14,7 +14,7 @@
         "php": "~8.4.0 || ~8.5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^12.5.17",
+        "phpunit/phpunit": "^13.1.1",
         "slam/php-cs-fixer-extensions": "^3.15.0"
     },
     "autoload": {