force minimum phpunit version to avoid deprecations in lowest

Author: dbu

composer.json

@@ -18,7 +18,7 @@
         "symfony/options-resolver": "^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "^6.0 || ^7.0 || ^8.0"
+        "symfony/phpunit-bridge": "^7.4 || ^8.0"
     },
     "autoload": {
         "psr-4": {