Merge branch '6.4' into 7.3

* 6.4:
  Remove calls to no-op functions, deprecated in PHP 8.5
  Remove deprecated calls to deprecated methods of SplObjectStorage
  [Messenger] Show package installation hint also for amqps

Author: nicolas-grekas

Debug/TraceableEventDispatcher.php

@@ -259,7 +259,7 @@ private function preProcess(string $eventName): void
             $this->wrappedListeners[$eventName][] = $wrappedListener;
             $this->dispatcher->removeListener($eventName, $listener);
             $this->dispatcher->addListener($eventName, $wrappedListener, $priority);
-            $this->callStack->attach($wrappedListener, [$eventName, $this->currentRequestHash]);
+            $this->callStack[$wrappedListener] = [$eventName, $this->currentRequestHash];
         }
     }
 
@@ -283,7 +283,7 @@ private function postProcess(string $eventName): void
             if ($listener->wasCalled()) {
                 $this->logger?->debug('Notified event "{event}" to listener "{listener}".', $context);
             } else {
-                $this->callStack->detach($listener);
+                unset($this->callStack[$listener]);
             }
 
             if (null !== $this->logger && $skipped) {