Allow Symfony 7 packages (#6)

Author: FabianSchmick

composer.json

@@ -13,10 +13,10 @@
 
     "require": {
         "php": "7.2.*|7.4.*|8.0.*|8.1.*|8.2.*|8.3.*",
-        "symfony/config": "^2.4|^3.0|^4.0|^5.0|^6.0",
-        "symfony/console": "^2.4|^3.0|^4.0|^5.0|^6.0",
-        "symfony/dependency-injection": "^2.4|^3.0|^4.0|^5.0|^6.0",
-        "symfony/http-kernel": "^2.4|^3.0|^4.0|^5.0|^6.0",
+        "symfony/config": "^2.4|^3.0|^4.0|^5.0|^6.0|^7.0",
+        "symfony/console": "^2.4|^3.0|^4.0|^5.0|^6.0|^7.0",
+        "symfony/dependency-injection": "^2.4|^3.0|^4.0|^5.0|^6.0|^7.0",
+        "symfony/http-kernel": "^2.4|^3.0|^4.0|^5.0|^6.0|^7.0",
         "webfactory/content-mapping": "^3.0"
     },