update live-component to require php 8+

Author: kbond

src/LiveComponent/composer.json

@@ -26,7 +26,7 @@
         }
     },
     "require": {
-        "php": ">=7.4",
+        "php": ">=8.0",
         "symfony/ux-twig-component": "^1.4"
     },
     "require-dev": {