Merge branch '6.4' into 7.3

* 6.4:
  [HttpKernel] Simplified multi-app config

configuration/multiple_kernels.rst

@@ -124,18 +124,13 @@ resources::
 
     class Kernel extends BaseKernel
     {
-        use MicroKernelTrait;
+        use MicroKernelTrait { getConfigDir as getSharedConfigDir; }
 
         public function __construct(string $environment, bool $debug, private string $id)
         {
             parent::__construct($environment, $debug);
         }
 
-        public function getSharedConfigDir(): string
-        {
-            return $this->getProjectDir().'/config';
-        }
-
         public function getAppConfigDir(): string
         {
             return $this->getProjectDir().'/apps/'.$this->id.'/config';