add PHP 8.0 support

Author: Gummibeer

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php": "^7.1 || ^8.0",
-        "astrotomic/php-conditional-proxy": "^0.2.0"
+        "astrotomic/php-conditional-proxy": "^0.2.1"
     },
     "require-dev": {
         "pestphp/pest": "^0.3.0",