Update minimum constraint for test suite

Author: drbyte

composer.json

@@ -31,7 +31,7 @@
     "require-dev": {
         "laravel/passport": "^11.0|^12.0",
         "laravel/pint": "^1.0",
-        "orchestra/testbench": "^6.23|^7.0|^8.0|^9.0|^10.0",
+        "orchestra/testbench": "^6.23|^7.0|^8.0|^9.3|^10.0",
         "phpunit/phpunit": "^9.4|^10.1|^11.5"
     },
     "minimum-stability": "dev",