Allow Symfony 8 packages in require-dev (#272)

Author: JanTvrdik

composer.json

@@ -36,13 +36,13 @@
         "shipmonk/name-collision-detector": "^2.1.1",
         "shipmonk/phpstan-dev": "^0.1.1",
         "shipmonk/phpstan-rules": "^4.1.0",
-        "symfony/contracts": "^2.5 || ^3.0",
-        "symfony/dependency-injection": "^5.4 || ^6.0 || ^7.0",
-        "symfony/doctrine-bridge": "^5.4 || ^6.0 || ^7.0",
-        "symfony/event-dispatcher": "^5.4 || ^6.0 || ^7.0",
-        "symfony/http-kernel": "^5.4 || ^6.0 || ^7.0",
-        "symfony/routing": "^5.4 || ^6.0 || ^7.0",
-        "symfony/validator": "^5.4 || ^6.0 || ^7.0",
+        "symfony/contracts": "^2.5 || ^3.0 || ^4.0",
+        "symfony/dependency-injection": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/doctrine-bridge": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/event-dispatcher": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/http-kernel": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/routing": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/validator": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "twig/twig": "^3.0"
     },
     "autoload": {