Allow symfony/var-dumper 8

Author: kylekatarnls

composer.json

@@ -24,7 +24,7 @@
     "minimum-stability": "dev",
     "require": {
         "php": "^7.1 || ^8.0",
-        "symfony/var-dumper": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0"
+        "symfony/var-dumper": "^3.4 || ^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
         "cebe/markdown": "^1.1",