updated version of testbench

Author: saqueib

composer.json

@@ -22,9 +22,9 @@
     "laravel/framework": "~5.4.0|~5.5.0|~5.6.0|~5.7.0|~5.8.0|^6.0|^7.0"
   },
   "require-dev": {
-    "orchestra/testbench": "~3.4|^4.0",
+    "orchestra/testbench": "3.8.*|4.*|5.*",
     "mockery/mockery": "^0.9.4 || ~1.0",
-    "phpunit/phpunit": "^8.0"
+    "phpunit/phpunit": "^8.5"
   },
   "autoload": {
     "classmap": [