Fix PHP version constraint

Author: shochdoerfer

composer.json

@@ -19,7 +19,7 @@
     }
   ],
   "require": {
-    "php": "^7.2.0 || ^8.0.0",
+    "php": "^7.2.0 || ^8.1.0",
     "ext-dom": "*",
     "laminas/laminas-code": "~3.3.0 || ~3.4.1 || ~3.5.1 || ~4.5.0",
     "phpstan/phpstan": "^1.5.0",