Merge branch '4.4'

* 4.4: (21 commits)
  [appveyor] exclude tty group
  [HttpFoundation] Add types to private/final/internal methods and constructors.
  Add types to private/final/internal methods and constructors.
  SCA: minor code tweaks
  Tweak output
  [FrameworkBundle] Added --sort option for TranslationUpdateCommand
  [HttpClient] fallbackto CURLMOPT_MAXCONNECTS when CURLMOPT_MAX_HOST_CONNECTIONS is not available
  [DI] generate preload.php file for PHP 7.4 in cache folder
  Allow version 2 of the contracts package.
  [Serializer] Allow multi-dimenstion object array in AbstractObjectNormalizer
  fixed typo
  [HttpKernel] Fix Apache mod_expires Session Cache-Control issue
  deprecated not passing dash symbol (-) to STDIN commands
  [VarDumper] display ellipsed FQCN for nested classes
  [VarDumper] Display fully qualified title
  [Mailer] Change the syntax for DSNs using failover or roundrobin
  Removed workaround introduced in 4.3
  [Console] Added support for definition list
  [OptionsResolver] Display full nested options hierarchy in exceptions
  New welcome page
  ...

Author: nicolas-grekas

composer.json

@@ -19,7 +19,7 @@
         "php": "^7.2.9",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",
-        "symfony/translation-contracts": "^1.1"
+        "symfony/translation-contracts": "^1.1|^2"
     },
     "require-dev": {
         "symfony/http-client": "^4.4|^5.0",