Downgraded phpunit

Author: whizsid

composer.json

@@ -27,7 +27,7 @@
         "guzzlehttp/guzzle":"<7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^8.0",
         "vimeo/psalm": "4.x-dev"
     }
 }