Update phpstan

Author: AydinHassan

composer.json

@@ -37,9 +37,8 @@
         "phpunit/phpunit": "^8.5",
         "composer/composer": "^2.0",
         "squizlabs/php_codesniffer": "^3.4",
-        "phpstan/phpstan": "^0.12.50",
+        "phpstan/phpstan": "^1.8",
         "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan-symfony": "^0.12.8",
         "yoast/phpunit-polyfills": "^0.2.0"
     },
     "autoload" : {