Merge branch '4.3' into 4.4

* 4.3:
  [4.3] Cleanup tests
  Cleanup tests
  [Finder] Prevent unintentional file locks in Windows
  [FrameworkBundle] Fix about command not showing .env vars
  [DomCrawler] Fix FileFormField PHPDoc
  [Mailer] Remove the default dispatcher in AbstractTransport
  Fix #33395 PHP 5.3 compatibility

Author: nicolas-grekas

Command/AboutCommand.php

@@ -131,9 +131,9 @@ private static function isExpired(string $date): bool
     private static function getDotenvVars(): array
     {
         $vars = [];
-        foreach (explode(',', getenv('SYMFONY_DOTENV_VARS')) as $name) {
-            if ('' !== $name && false !== $value = getenv($name)) {
-                $vars[$name] = $value;
+        foreach (explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? $_ENV['SYMFONY_DOTENV_VARS'] ?? '') as $name) {
+            if ('' !== $name && isset($_ENV[$name])) {
+                $vars[$name] = $_ENV[$name];
             }
         }