fix GitHub actions

Author: natsumework

.github/workflows/test.yml

@@ -39,6 +39,9 @@ jobs:
                       php: 8.2
                     - laravel: 7.*
                       php: 8.3
+                    - laravel: 8.*
+                      php: 8.1
+                      dependency-version: prefer-lowest
                     - laravel: 8.*
                       php: 8.2
                     - laravel: 8.*

composer.json

@@ -23,7 +23,8 @@
     },
     "require-dev": {
         "orchestra/testbench": ">=6.9",
-        "phpunit/phpunit": ">=8.0"
+        "phpunit/phpunit": ">=8.5.23",
+        "nesbot/carbon": ">=2.62.1"
     },
     "autoload": {
         "psr-4": {