Merge branch '5.4' into 6.2

* 5.4:
  Speed up Psalm tests
  [GHA] Improve workflow titles
  [GHA] Improve workflow titles
  Fix fix
  [Notifier] Fix notifier profiler when transport name is null
  [HttpKernel] Fix setting the session on the main request when it's started by a subrequest

Author: nicolas-grekas

Event/NotificationEvents.php

@@ -24,7 +24,7 @@ class NotificationEvents
     public function add(MessageEvent $event): void
     {
         $this->events[] = $event;
-        $this->transports[$event->getMessage()->getTransport()] = true;
+        $this->transports[(string) $event->getMessage()->getTransport()] = true;
     }
 
     public function getTransports(): array
@@ -43,7 +43,7 @@ public function getEvents(string $name = null): array
 
         $events = [];
         foreach ($this->events as $event) {
-            if ($name === $event->getMessage()->getTransport()) {
+            if ($name === (string) $event->getMessage()->getTransport()) {
                 $events[] = $event;
             }
         }