chore(deps): update dependency phpunit/phpunit to v12.3.9

Author: renovate[bot]

api/composer.json

@@ -69,7 +69,7 @@
         "php-coveralls/php-coveralls": "2.8.0",
         "phpspec/prophecy-phpunit": "2.4.0",
         "phpstan/phpstan": "2.1.23",
-        "phpunit/phpunit": "12.3.8",
+        "phpunit/phpunit": "12.3.9",
         "rector/rector": "2.1.7",
         "psalm/phar": "6.13.1",
         "spatie/phpunit-snapshot-assertions": "5.2.2",