MC-14917: Update Symfony components to 4.4LTS for 2.4.x

Author: irenelagno

composer.json

@@ -10,12 +10,6 @@
         "preferred-install": "dist",
         "sort-packages": true
     },
-    "repositories": [
-        {
-            "type": "git",
-            "url": "https://github.com/magento/composer"
-        }
-    ],
     "require": {
         "php": "~7.1.3||~7.2.0||~7.3.0",
         "ext-bcmath": "*",