Merge branch '3.4' into 4.2

* 3.4:
  [FrameworkBundle] [SecurityBundle] Rename internal WebTestCase to avoid confusion
  revert private properties handling
  [HttpFoundation] Fix URLs
  [VarDumper] finish PHP 7.4 support and add tests
  [VarDumper] Use \ReflectionReference for determining if a key is a reference (php >= 7.4)
  Ignore missing translation dependency in FrameworkBundle
  [Debug][ExceptionHandler] Add tests for custom handlers

Author: nicolas-grekas

Session/Storage/Handler/MongoDbSessionHandler.php

@@ -17,7 +17,7 @@
  * @author Markus Bachmann <[email protected]>
  *
  * @see https://packagist.org/packages/mongodb/mongodb
- * @see http://php.net/manual/en/set.mongodb.php
+ * @see https://php.net/mongodb
  */
 class MongoDbSessionHandler extends AbstractSessionHandler
 {

Session/Storage/Handler/NativeFileSessionHandler.php

@@ -23,7 +23,7 @@ class NativeFileSessionHandler extends \SessionHandler
      *                         Default null will leave setting as defined by PHP.
      *                         '/path', 'N;/path', or 'N;octal-mode;/path
      *
-     * @see http://php.net/session.configuration.php#ini.session.save-path for further details.
+     * @see https://php.net/manual/session.configuration.php#ini.session.save-path for further details.
      *
      * @throws \InvalidArgumentException On invalid $savePath
      * @throws \RuntimeException         When failing to create the save directory