Updating composer

Updating composer.json in pkg directory to correctly reflect the
supported versions of PHP

Author: JimTools

composer.json

@@ -6,7 +6,7 @@
     "homepage": "https://enqueue.forma-pro.com/",
     "license": "MIT",
     "require": {
-        "php": "^7.4|^8.0"
+        "php": "^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5"