Upgraded PHPUnit to accept PHP 8.2 upgrade

Author: gplanchat

composer.json

@@ -21,7 +21,7 @@
         "php-etl/fast-map-plugin": "^0.7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0",
+        "phpunit/phpunit": "^9.5",
         "php-etl/phpunit-extension": "^0.4.0",
         "adlawson/vfs": "^0.12.1",
         "phpstan/phpstan": "^0.12.93",