Merge branch '5.4' into 6.3

* 5.4:
  [Mime] Fix serializing uninitialized RawMessage::$message to null
  [Notifer][Smsapi] Set messageId of SentMessage
  [DX] Use Symfony "dark-mode"-responsive logo in README
  support lazy evaluated exception messages with Xdebug 3

Author: nicolas-grekas

Tests/Mime/TemplatedEmailTest.php

@@ -95,8 +95,7 @@ public function testSymfonySerialize()
             }
         ]
     },
-    "body": null,
-    "message": null
+    "body": null
 }
 EOF;
 

composer.json

@@ -44,7 +44,7 @@
         "symfony/security-core": "^5.4|^6.0",
         "symfony/security-csrf": "^5.4|^6.0",
         "symfony/security-http": "^5.4|^6.0",
-        "symfony/serializer": "^6.2",
+        "symfony/serializer": "~6.3.12|^6.4.3",
         "symfony/stopwatch": "^5.4|^6.0",
         "symfony/console": "^5.4|^6.0",
         "symfony/expression-language": "^5.4|^6.0",