Fix PHP 8 version notation

Author: avstudnitz

composer.json

@@ -25,7 +25,7 @@
         }
     ],
     "require": {
-        "php": "~7.1||~7.2||~7.3||~7.4||8.1",
+        "php": "~7.1||~7.2||~7.3||~7.4||~8.1",
         "magento/framework": "^102.0.0||^103.0.0"
     },
     "require-dev": {