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

Author: nicolas-grekas

Psr18Client.php

@@ -190,7 +190,7 @@ public function createUri(string $uri = ''): UriInterface
 /**
  * @internal
  */
-trait Psr18ExceptionTrait
+class Psr18NetworkException extends \RuntimeException implements NetworkExceptionInterface
 {
     private $request;
 
@@ -206,18 +206,21 @@ public function getRequest(): RequestInterface
     }
 }
 
-/**
- * @internal
- */
-class Psr18NetworkException extends \RuntimeException implements NetworkExceptionInterface
-{
-    use Psr18ExceptionTrait;
-}
-
 /**
  * @internal
  */
 class Psr18RequestException extends \InvalidArgumentException implements RequestExceptionInterface
 {
-    use Psr18ExceptionTrait;
+    private $request;
+
+    public function __construct(TransportExceptionInterface $e, RequestInterface $request)
+    {
+        parent::__construct($e->getMessage(), 0, $e);
+        $this->request = $request;
+    }
+
+    public function getRequest(): RequestInterface
+    {
+        return $this->request;
+    }
 }