For this problem you have to Deletedelete these lines in Composer.json, this lines and it had beenis solved
"require-dev": { "allure-framework/allure-phpunit": "~1.2.0", "friendsofphp/php-cs-fixer": "~2.13.0", "lusitanian/oauth": "~0.8.10", "magento/magento-coding-standard": "~1.0.0", "magento/magento2-functional-testing-framework": "~2.3.14", "pdepend/pdepend": "2.5.2", "phpmd/phpmd": "@stable", "phpunit/phpunit": "~6.5.0", "sebastian/phpcpd": "~3.0.0", "squizlabs/php_codesniffer": "3.3.1" },
"require-dev": {
"allure-framework/allure-phpunit": "~1.2.0",
"friendsofphp/php-cs-fixer": "~2.13.0",
"lusitanian/oauth": "~0.8.10",
"magento/magento-coding-standard": "~1.0.0",
"magento/magento2-functional-testing-framework": "~2.3.14",
"pdepend/pdepend": "2.5.2",
"phpmd/phpmd": "@stable",
"phpunit/phpunit": "~6.5.0",
"sebastian/phpcpd": "~3.0.0",
"squizlabs/php_codesniffer": "3.3.1"
},