update dependencies in order to make mftf php8 compatible, fix running phpcpd

Author: sergeynezbritskiy

Diff for: composer.json

@@ -47,7 +47,7 @@
         "phpmd/phpmd": "^2.8.0",
         "phpunit/phpunit": "^9.0",
         "rregeer/phpunit-coverage-check": "^0.1.4",
-        "sebastian/phpcpd": "~5.0.0",
+        "sebastian/phpcpd": "~6.0.0",
         "squizlabs/php_codesniffer": "~3.5.4",
         "symfony/stopwatch": "~3.4.6"
     },