Update composer.json to use Mockery 1.6.x

composer.json

@@ -43,7 +43,7 @@
     },
     "require-dev": {
         "pestphp/pest": "2.x-dev",
-        "mockery/mockery": "2.0.x-dev",
+        "mockery/mockery": "^1.6",
         "guzzlehttp/guzzle": "^7.0",
         "phpstan/phpstan": "1.11.x-dev"
     },