Merge branch '6.3' into 6.4

* 6.3:
  [AssetMapper] Handle assets with non-ascii characters in dev server
  [Translation] Fix `TranslationNodeVisitor` with constant domain
  [Messenger] [AMQP] Throw exception on `nack` callback
  [Validator] revise Latvian translations
  [ErrorHandler] Fix `RecursiveDirectoryIterator` exception with wrong composer autoload
  [HttpFoundation] Request without content-type or content-length header should result in null values, not empty strings
  [Cache] Fix possible infinite loop in `CachePoolPass`
  grab a service from the container only if it exists
  [Mime] Fix undefined array key 0 when empty sender
  [Console] Allow '0' as a $shortcut in InputOption.php
  fix multi-byte code area to convert
  [Validator] Make it explicit when English translation differs from its resource name

Transport/Connection.php

@@ -13,6 +13,7 @@
 
 use Symfony\Component\Messenger\Exception\InvalidArgumentException;
 use Symfony\Component\Messenger\Exception\LogicException;
+use Symfony\Component\Messenger\Exception\TransportException;
 
 /**
  * An AMQP connection.
@@ -493,7 +494,7 @@ public function channel(): \AMQPChannel
                 $this->amqpChannel->confirmSelect();
                 $this->amqpChannel->setConfirmCallback(
                     static fn (): bool => false,
-                    static fn (): bool => false
+                    static fn () => throw new TransportException('Message publication failed due to a negative acknowledgment (nack) from the broker.'),
                 );
             }