MC-40591: Update Magento core

-- fix merge conflicts

Author: fascinosum

composer.json

@@ -10,8 +10,14 @@
         "preferred-install": "dist",
         "sort-packages": true
     },
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/magento-commerce/magento2-functional-testing-framework"
+        }
+    ],
     "require": {
-        "php": "~7.1.3||~7.2.0||~7.3.0",
+        "php": "~7.3.0",
         "ext-bcmath": "*",
         "ext-ctype": "*",
         "ext-curl": "*",
@@ -86,17 +92,17 @@
     "require-dev": {
         "allure-framework/allure-phpunit": "~1.2.0",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
-        "friendsofphp/php-cs-fixer": "~2.14.0",
+        "friendsofphp/php-cs-fixer": "~2.16.0",
         "lusitanian/oauth": "~0.8.10",
         "magento/magento-coding-standard": "*",
-        "magento/magento2-functional-testing-framework": "~2.6.5",
-        "pdepend/pdepend": "2.5.2",
+        "magento/magento2-functional-testing-framework": "MQE-2488-php73-dev",
+        "pdepend/pdepend": "~2.7.1",
         "phpcompatibility/php-compatibility": "^9.3",
         "phpmd/phpmd": "@stable",
         "phpstan/phpstan": ">=0.12.3 <=0.12.23",
-        "phpunit/phpunit": "~6.5.0",
-        "sebastian/phpcpd": "~3.0.0",
-        "squizlabs/php_codesniffer": "~3.4.0"
+        "phpunit/phpunit": "^9",
+        "sebastian/phpcpd": "~5.0.0",
+        "squizlabs/php_codesniffer": "~3.5.4"
     },
     "suggest": {
         "ext-pcntl": "Need for run processes in parallel mode"