#4 Apply <10.0 restriction on phpunit/phpunit since configuration file is not compatible with 10.0+

Author: njoubert-cleverage

composer.json

@@ -40,7 +40,7 @@
         "phpstan/extension-installer": "*",
         "phpstan/phpstan": "*",
         "phpstan/phpstan-symfony": "*",
-        "phpunit/phpunit": "*",
+        "phpunit/phpunit": "<10.0",
         "rector/rector": "*",
         "roave/security-advisories": "dev-latest",
         "symfony/test-pack": "^1.1"