Update composer.json

Author: nunoplopes

composer.json

@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "php": "^7.2.5 || ^8.0",
+        "php": "^8.0",
         "ext-json": "*",
         "php-http/cache-plugin": "^1.7.1|^2.0",
         "php-http/client-common": "^2.3",
@@ -28,7 +28,6 @@
         "psr/http-client-implementation": "^1.0",
         "psr/http-factory-implementation": "^1.0",
         "psr/http-message": "^1.0|^2.0",
-        "symfony/polyfill-php80": "^1.17",
         "symfony/deprecation-contracts": "^2.2|^3.0"
     },
     "require-dev": {