allow 6.4 version

Author: michael-rubel

composer.json

@@ -28,7 +28,7 @@
         "nunomaduro/larastan": "^1.0",
         "orchestra/testbench": "^6.6|^7.0",
         "phpunit/phpunit": "^9.5",
-        "roave/backward-compatibility-check": "^7.0"
+        "roave/backward-compatibility-check": "^6.4|^7.0"
     },
     "autoload": {
         "psr-4": {