Merge branch '7.1' into 7.2

* 7.1:
  Replace external FTP server by a local docker instance
  [PhpUnitBridge][Console][VarDumper] Fix handling NO_COLOR env var
  fix test
  [Validator] Add test for `D` regex modifier in `TimeValidator`

Author: nicolas-grekas

DeprecationErrorHandler.php

@@ -407,7 +407,7 @@ private static function hasColorSupport(): bool
         }
 
         // Follow https://no-color.org/
-        if ('' !== ($_SERVER['NO_COLOR'] ?? getenv('NO_COLOR') ?: '')) {
+        if ('' !== (($_SERVER['NO_COLOR'] ?? getenv('NO_COLOR'))[0] ?? '')) {
             return false;
         }