Support Backpack v6

Author: maurohmartinez

composer.json

@@ -5,7 +5,7 @@
     "require": {
         "php": "^7.3|^8.0",
         "laravel/framework": "^8.0.0|^9.0.0|^10.0.0",
-        "backpack/crud": "^5.0"
+        "backpack/crud": "^5.0|^6.0"
     },
     "keywords": [
         "backpack",