Update composer requirements for laravel 8

Author: lucasppons

composer.json

@@ -10,14 +10,14 @@
         }
     ],
     "require": {
-        "php": "^7.2.5",
-        "illuminate/support": "^7.0",
-        "illuminate/database": "^7.0",
-        "illuminate/validation": "^7.0"
+        "php": "^7.3 || ^8.0",
+        "illuminate/support": "^8.0",
+        "illuminate/database": "^8.40",
+        "illuminate/validation": "^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0",
-        "mockery/mockery": "^1.2.1",
+        "phpunit/phpunit": "^8.0 || ^9.0",
+        "mockery/mockery": "^1.4.1",
         "squizlabs/php_codesniffer": "^3.1",
         "php-coveralls/php-coveralls": "^2.4"
     },