build(composer): upated PHP version required to ^7.4

Author: José Postiga

composer.json

@@ -8,7 +8,7 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^7.2.5",
+        "php": "^7.4",
         "fideloper/proxy": "^4.0",
         "fruitcake/laravel-cors": "^1.0",
         "laravel/framework": "^7.0",