Merge branch '4.4'

* 4.4:
  [Mailer] Fix SmtpEnvelope renaming to Envelope
  fixed "link" to Contracts packages
  [WebProfilerBundle] Fix time panel legend buttons
  Some styling tweaks
  Fixed cache pools affecting each other due to an overwritten seed variable
  don't change state in case of exception
  properly catch legacy tag syntax usages
  minor tweaks to the welcome page

Author: xabbuh

Event/MessageEvent.php

@@ -16,7 +16,7 @@
 use Symfony\Contracts\EventDispatcher\Event;
 
 /**
- * Allows the transformation of a Message and the SMTP Envelope before the email is sent.
+ * Allows the transformation of a Message and the Envelope before the email is sent.
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
@@ -45,12 +45,12 @@ public function setMessage(RawMessage $message): void
         $this->message = $message;
     }
 
-    public function getEnvelope(): SmtpEnvelope
+    public function getEnvelope(): Envelope
     {
         return $this->envelope;
     }
 
-    public function setEnvelope(SmtpEnvelope $envelope): void
+    public function setEnvelope(Envelope $envelope): void
     {
         $this->envelope = $envelope;
     }