Update dependency phpunit/phpunit to v13 (#65)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -30,7 +30,7 @@
         "phpstan/phpstan": "^2.0",
         "phpstan/phpstan-phpunit": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
-        "phpunit/phpunit": "^10.5 || ^11.5 || ^12.0",
+        "phpunit/phpunit": "^10.5 || ^11.5 || ^12.0 || ^13.0",
         "roave/security-advisories": "dev-latest",
         "squizlabs/php_codesniffer": "^4.0"
     },