Fix compatibility with Laravel 12

Author: besanek

composer.json

@@ -12,12 +12,12 @@
         "illuminate/notifications": "^10.0|^11.0|^12.0",
         "illuminate/support": "^10.0|^11.0|^12.0",
         "php": "^8.0",
-        "kreait/laravel-firebase": "^5.1",
+        "kreait/laravel-firebase": "^5.1|^6.0",
         "ext-json": "*"
     },
     "require-dev": {
         "orchestra/testbench": "^8.0|^9.0|^10.0",
-        "phpunit/phpunit": "^9.0",
+        "phpunit/phpunit": "^9.0|^10.0|^11.0",
         "mockery/mockery": "^1.4.2"
     },
     "authors": [