Allow Symfony 6 HTTP Client to support PHP 8.1 in tests

Author: bennothommo

composer.json

@@ -36,7 +36,7 @@
     },
     "require-dev": {
         "nyholm/psr7": "^1.8",
-        "symfony/http-client": "^7.0",
+        "symfony/http-client": "^6.0 || ^7.0",
         "php-http/message": "^1.0",
         "phpstan/phpstan": "^1.6",
         "phpunit/phpunit": "^10.5"