Drop Symfony v6.3 support (#35)

Author: PabloKowalczyk

composer.json

@@ -24,9 +24,9 @@
     },
     "require": {
         "php": ">=8.0",
-        "symfony/config": "^5.4 || ^6.3 || ^7.0",
-        "symfony/dependency-injection": "^5.4 || ^6.3 || ^7.0",
-        "symfony/http-kernel": "^5.4 || ^6.3 || ^7.0"
+        "symfony/config": "^5.4 || ^6.4 || ^7.0",
+        "symfony/dependency-injection": "^5.4 || ^6.4 || ^7.0",
+        "symfony/http-kernel": "^5.4 || ^6.4 || ^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.4"