phpバージョン変更

composer.json

@@ -3,7 +3,7 @@
     "description": "A self-made CSV library by winas.",
     "type": "library",
     "require": {
-        "php": "8.0",
+        "php": "8.1",
         "laravel/laravel": "11"
     },
     "license": "MIT",