Update friendsofphp/php-cs-fixer to a version compatible with php8

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

composer.json

@@ -42,7 +42,7 @@
         "phpunit/phpunit": "^8.0",
         "psr/log": "^1.0",
         "php-coveralls/php-coveralls": "^2.0",
-        "friendsofphp/php-cs-fixer": "^2.13",
+        "friendsofphp/php-cs-fixer": "^2.17",
         "php-parallel-lint/php-parallel-lint": "^1.2"
     },
     "extra": {