Merge branch '4.3' into 4.4

* 4.3:
  [ProxyManager] fix generating proxies for root-namespaced classes
  [DI] skip looking for config class when the extension class is anonymous
  Fix typo
  [Dotenv] FIX missing getenv
  [HttpClient][Psr18Client] Remove Psr18ExceptionTrait

Session/Storage/NativeSessionStorage.php

@@ -401,13 +401,11 @@ public function setOptions(array $options)
      *     ini_set('session.save_path', '/tmp');
      *
      * or pass in a \SessionHandler instance which configures session.save_handler in the
-     * constructor, for a template see NativeFileSessionHandler or use handlers in
-     * composer package drak/native-session
+     * constructor, for a template see NativeFileSessionHandler.
      *
      * @see https://php.net/session-set-save-handler
      * @see https://php.net/sessionhandlerinterface
      * @see https://php.net/sessionhandler
-     * @see https://github.com/zikula/NativeSession
      *
      * @param AbstractProxy|\SessionHandlerInterface|null $saveHandler
      *