chore: prepare for v7

Author: fogrye

Diff for: composer.json

@@ -18,15 +18,15 @@
   ],
   "require" : {
     "php" : ">=8.1",
-    "thecodingmachine/graphqlite" : "^6.0|^7.0",
-    "symfony/validator": "^6|^7"
+    "thecodingmachine/graphqlite" : "^7.0",
+    "symfony/validator": "^7"
   },
   "require-dev": {
     "phpunit/phpunit": "^9.6.5",
     "mouf/picotainer": "^1.1",
     "phpstan/phpstan": "^1.8",
     "php-coveralls/php-coveralls": "^2.1.0",
-    "symfony/translation": "^6|^7",
+    "symfony/translation": "^7",
     "doctrine/coding-standard": "^11.1|^12.0"
   },
   "scripts": {
@@ -47,7 +47,7 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-master": "6.0.x-dev"
+      "dev-master": "7.0.x-dev"
     }
   },
   "minimum-stability": "dev",