chore(composer/package): support Laravel 8

Author: koshuang

composer.json

@@ -13,18 +13,19 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
+        "php": ">=7.3",
         "monolog/monolog": "^1.12|^2.0",
         "ramsey/uuid": "^4.0.0"
     },
     "require-dev": {
         "fzaninotto/faker": "^1.9@dev",
-        "illuminate/contracts": "^6.0|^7.0|^8.0|^9.0",
-        "illuminate/log": "^6.0|^7.0|^8.0|^9.0",
-        "illuminate/support": "^6.0|^7.0|^8.0|^9.0",
+        "illuminate/contracts": "^8.0",
+        "illuminate/log": "^8.0",
+        "illuminate/support": "^8.0",
         "mockery/mockery": "^1.3.2",
         "nunomaduro/larastan": "^1.0",
-        "orchestra/database": "^5.0",
-        "orchestra/testbench": "^5.0",
+        "orchestra/database": "^6.0",
+        "orchestra/testbench": "^6.0",
         "phpstan/phpstan": "^1.7",
         "phpunit/phpunit": "^8.0",
         "sempro/phpunit-pretty-print": "1.2.2",