Merge branch '4.4' into 5.4

* 4.4:
  [VarDumper] Fix dumping mysqli_driver instances
  Fix missing ReturnTypeWillChange attributes
  [Cache] Add missing log when saving namespace
  [HttpKernel] Reset services between requests performed by KernelBrowser
  [HttpKernel] Remove unused argument in ArgumentMetadataFactory

Author: nicolas-grekas

Session/Storage/Handler/RedisSessionHandler.php

@@ -109,6 +109,7 @@ protected function doDestroy(string $sessionId): bool
     /**
      * {@inheritdoc}
      */
+    #[\ReturnTypeWillChange]
     public function close(): bool
     {
         return true;