Merge branch '5.0'

* 5.0: (24 commits)
  Removing unused variable
  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
  Add supported schemes doc blocks type
  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
  [String][UnicodeString] Remove unneeded flag in chunk regex pattern
  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 5.0.3
  updated VERSION for 5.0.2
  ...

Author: nicolas-grekas

UnicodeString.php

@@ -71,7 +71,7 @@ public function chunk(int $length = 1): array
             $rx .= '\X{65535}';
             $length -= 65535;
         }
-        $rx .= '\X{'.$length.'})/us';
+        $rx .= '\X{'.$length.'})/u';
 
         $str = clone $this;
         $chunks = [];