Update dependencies to prep for Laravel 9

Author: miracuthbert

composer.json

@@ -15,16 +15,16 @@
         }
     ],
     "require": {
-        "php": ">=7.3.0",
+        "php": "^7.3|^8.0",
         "illuminate/console": ">=6.0",
         "illuminate/database": ">=6.0",
         "illuminate/http": ">=6.0",
         "illuminate/support": ">=6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.2.4",
-        "orchestra/testbench": "^6.2",
-        "laravel/legacy-factories": "1.0.4"
+        "phpunit/phpunit": ">=8.5",
+        "orchestra/testbench": ">=6.2",
+        "laravel/legacy-factories": ">=1.0.4"
     },
     "autoload": {
         "psr-4": {