Move phpunit to require dev

Author: AydinHassan

composer.json

@@ -31,10 +31,10 @@
         "nikic/php-parser": "^4.0",
         "guzzlehttp/guzzle": "^7.2",
         "psr/log": "^1.1",
-        "ext-json": "*",
-        "phpunit/phpunit": "^8.5"
+        "ext-json": "*"
     },
     "require-dev": {
+        "phpunit/phpunit": "^8.5",
         "composer/composer": "^2.0",
         "squizlabs/php_codesniffer": "^3.4",
         "phpstan/phpstan": "^0.12.50",