Updates dompdf version for php 8

Author: mc0de

composer.json

@@ -14,7 +14,7 @@
     "keywords": ["Laravel", "Invoice", "Invoices"],
     "require": {
         "php": ">=7.3",
-        "barryvdh/laravel-dompdf": "^0.8.5",
+        "barryvdh/laravel-dompdf": "^0.9",
         "illuminate/support": "^5.5|^6|^7|^8",
         "illuminate/http": "^5.5|^6|^7|^8"
     },