Merge branch '6.3' into 6.4

* 6.3:
  minor #53524 [Messenger] [AmazonSqs] Allow `async-aws/sqs` version 2 (smoench)
  Fix bad merge
  List CS fix in .git-blame-ignore-revs
  Fix implicitly-required parameters
  List CS fix in .git-blame-ignore-revs
  Apply php-cs-fixer fix --rules nullable_type_declaration_for_default_null_value

Author: nicolas-grekas

Tests/ZulipTransportTest.php

@@ -21,7 +21,7 @@
 
 final class ZulipTransportTest extends TransportTestCase
 {
-    public static function createTransport(HttpClientInterface $client = null): ZulipTransport
+    public static function createTransport(?HttpClientInterface $client = null): ZulipTransport
     {
         return (new ZulipTransport('testEmail', 'testToken', 'testChannel', $client ?? new MockHttpClient()))->setHost('test.host');
     }

ZulipOptions.php

@@ -21,7 +21,7 @@ final class ZulipOptions implements MessageOptionsInterface
     private ?string $topic;
     private ?string $recipient;
 
-    public function __construct(string $topic = null, string $recipient = null)
+    public function __construct(?string $topic = null, ?string $recipient = null)
     {
         $this->topic = $topic;
         $this->recipient = $recipient;

ZulipTransport.php

@@ -31,7 +31,7 @@ final class ZulipTransport extends AbstractTransport
     private string $token;
     private string $channel;
 
-    public function __construct(string $email, #[\SensitiveParameter] string $token, string $channel, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null)
+    public function __construct(string $email, #[\SensitiveParameter] string $token, string $channel, ?HttpClientInterface $client = null, ?EventDispatcherInterface $dispatcher = null)
     {
         $this->email = $email;
         $this->token = $token;