Simplify PHP version declaration

Author: PowerKiKi

composer.json

@@ -21,7 +21,7 @@
     }
   },
   "require": {
-    "php": "^7.1 || ^7.2 || ^7.3 || ^7.4 || ^8.0",
+    "php": "^7.1 || ^8.0",
     "ext-mbstring": "*",
     "sabberworm/php-css-parser": "^8.4"
   },