Merge branch '5.2' into 5.3

* 5.2:
  CS fix
  CS fix
  CS fixes
  Bump Symfony version to 5.2.12
  Update VERSION for 5.2.11
  Update CHANGELOG for 5.2.11
  Bump Symfony version to 4.4.27
  Update VERSION for 4.4.26
  Update CONTRIBUTORS for 4.4.26
  Update CHANGELOG for 4.4.26

Author: nicolas-grekas

DataCollector/RequestDataCollector.php

@@ -34,7 +34,7 @@ class RequestDataCollector extends DataCollector implements EventSubscriberInter
     private $sessionUsages = [];
     private $requestStack;
 
-    public function __construct(?RequestStack $requestStack = null)
+    public function __construct(RequestStack $requestStack = null)
     {
         $this->controllers = new \SplObjectStorage();
         $this->requestStack = $requestStack;