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

Author: njoubert-cleverage

composer.json

@@ -77,7 +77,7 @@
     "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"