update composer.json

composer.json

@@ -41,7 +41,6 @@
     "doctrine/doctrine-bundle": "^1.3 || ^2.0",
     "friendsofphp/php-cs-fixer": "^2.2",
     "phpunit/phpunit": "^4.8.35 || ^5.7.11 || ^6.5 || ^8",
-    "swiftmailer/swiftmailer": "^4.3 || ^5.0 || ^6.0",
     "symfony/console": "^4.4 || ^5.0",
     "symfony/phpunit-bridge": "^3.4 || ^4.2 || ^5.0",
     "symfony/yaml": "^4.4 || ^5.0"