Drop support of PHP 7.4 and Symfony 4.4 (#51)

Author: yann-eugone

composer.json

@@ -11,9 +11,9 @@
         }
     ],
     "require": {
-        "php": "^7.4|^8.0",
+        "php": "^8.0",
         "composer-runtime-api": "^2.0",
-        "symfony/framework-bundle": "^4.4|^5.0",
+        "symfony/framework-bundle": "^5.0|^6.0",
         "yokai/batch": "^0.4.0"
     },
     "autoload": {