Merge branch '4.4' into 5.0

* 4.4:
  Fixed #35084
  Add missing use statement
  [HttpClient] fix scheduling pending NativeResponse
  do not overwrite variable value
  [Profiler] wording
  Use spaces correctly to display options in DebugCommand
  X-Accel Nginx URL updated
  ticket-30197 [Validator] Add the missing translations for the Chinese (Taiwan) ("zh_TW") locale
  Fixed test added in #35022
  Use locale_parse for computing fallback locales
  [Console] Fix filtering out identical alternatives when there is a command loader
  add note about HTTP status code change
  Migrate server:log command away from WebServerBundle
  [DependencyInjection][CheckTypeDeclarationsPass] Handle \Closure for callable
  [Security] Fix missing defaults for auto-migrating encoders
  bumped Symfony version to 4.4.3
  updated VERSION for 4.4.2
  updated CHANGELOG for 4.4.2

Author: nicolas-grekas

Dumper/ContextProvider/CliContextProvider.php

@@ -25,7 +25,7 @@ public function getContext(): ?array
         }
 
         return [
-            'command_line' => $commandLine = implode(' ', $_SERVER['argv']),
+            'command_line' => $commandLine = implode(' ', $_SERVER['argv'] ?? []),
             'identifier' => hash('crc32b', $commandLine.$_SERVER['REQUEST_TIME_FLOAT']),
         ];
     }